Minor characters in CSI: Crime Scene Investigation
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The following are minor and recurring characters from the television show CSI: Crime Scene Investigation.
- 1 Crime Lab
- 1.1 Current
- 1.2 Former
- 1.2.1 CSI Level 1 Holly Gribbs (Chandra West, season 1)
- 1.2.2 CSI Level 3 Michael Keppler (Liev Schreiber, season 7)
- 1.2.3 CSI Level 1 Ronnie Lake (Jessica Lucas, season 8)
- 1.2.4 DNA Technician Mia Dickerson (Aisha Tyler, season 5)
- 1.2.5 Questioned Documents Technician Ronnie Litre (Eric Stonestreet, seasons 1-5)
- 1.2.6 Fingerprint Technician Charlotte Meridian (Susan Gibney, seasons 1-2)
- 1.2.7 Dr. Jenna Williams (Judith Scott, season 1)
- 1.2.8 Consultant Specialist Teri Miller (Pamela Gidley, seasons 1-3)
- 1.2.9 Consultant Specialist Prof. Rambar (Tony Amendola, seasons 1 & 6)
- 2 Las Vegas Police Department
- 2.1 Current Roster
- 2.2 Uniformed Officers
- 2.3 Old Rosters
- 2.3.1 Former Sheriffs
- 2.3.2 Former Detectives
- 22.214.171.124 LVPD Detective Frankie Reed (Katee Sackhoff, season 11)
- 126.96.36.199 LVPD Homicide Detective Sam Vega (Geoffrey Rivas, seasons 1-12)
- 188.8.131.52 LVPD Homicide Detective Sergeant Ray O'Riley (Skip O'Brien, seasons 1–4)
- 184.108.40.206 LVPD Homicide Detective Cyrus Lockwood (Jeffrey D. Sams, seasons 2–3)
- 220.127.116.11 LVPD Homicide Detective Chris Cavaliere (Jose Zuniga, seasons 4–6 & 9-10)
- 18.104.22.168 LVPD Homicide Detective Gabriel Williams (Gabriel Casseus, season 9)
- 3 Murderers
- 4 Others
- 5 References
- 6 See also
Ballistics Technician Bobby Dawson (Gerald McCullouch, seasons 1-10)
- A firearms and ballistics expert since the second episode ("Cool Change") where he tests the bullets of fallen CSI Holly Gribbs and proves she was shot with her own gun. He was a frequent suspect of murder in David Hodges's board game as seen in the Season 8 episode "You Kill Me". Bobby is a recurring character throughout the series. At the beginning of Season 12, it was revealed that Bobby had been transferred to the dayshift.
Fingerprint Technician Mandy Webster (Sheeri Rappaport, seasons 1-12)
- First appearing in the season one episode "Anonymous", Mandy is a fingerprint tech. Her quick tongue and witty comments often serve as comic relief throughout the series. Mandy Webster made CSI Nick Stokes serenade her with the song "Mandy" for his results in the seventh season episode "Happenstance". In the seventh season episode "Lab Rats", Mandy mocked fellow lab tech David Hodges's hush-hush attempt to gather lab techs together to investigate The Miniature Killer with an imitation of Miss Moneypenny from the James Bond films. Hodges gives her the nickname "Miss Mockery". Though she once said a murder involving teenagers may have had something to do with Grand Theft Auto games she still thinks it is a ton of fun. Mandy's comments about her love life are also regularly used as comic relief.
Video/Audio Technician Archie Johnson (Archie Kao, seasons 2-12)
- The audio/visual surveillance specialist. In the 7th season episode "Lab Rats" he assists Hodges, along with the other lab techs, in trying to figure out who the Miniature Killer is. Archie is a fan of science fiction, and he surfs when he can get away from the lab (season 7, "Lab Rats"). At the beginning of season 8 he has also taken over the role of handwriting analysis. He says it is to expand his horizons, and his paycheck.
Judie Tremont (Victoria Prescott, seasons 3-8)
- A new secretary of the crime lab in the Season 3 episode Blood Lust and onwards. She was used as an experiment in "Blood Lust" to represent a smaller person trying to drag a larger body. Judy is a semi-recurring character in the series.
CSI Level 1 Holly Gribbs (Chandra West, season 1)
- Originally intended to be a series regular, Holly was not well received by test audiences;[dubious ] as such, she was shot in the pilot episode. Despite efforts to save her, she did not survive her shooting, and as a result, Sara Sidle was introduced instead. Holly's mother, Jane, was a lieutenant in traffic who put the squeeze on the then-crime lab director Jim Brass to get Holly a job. Holly graduated with honors in criminal justice. Holly revealed being a CSI was her mother's dream, not hers, but was convinced to stay by Catherine Willows. When Warrick Brown left her alone at a crime scene in the pilot episode to go place a bet, she was shot when the suspect, Jerrod Cooper, returned to the scene. Despite efforts to save her, Holly eventually succumbed, dying during surgery at a hospital. She was mentioned in Season 1 episodes "Cool Change" and "The Strip Strangler", Season 3 episode "A Little Murder", and the Season 8 episode "For Gedda". Her conversation with Catherine Willows in the pilot episode was referenced in the Season 12 episode "Willows in the Wind" even though she wasn't directly mentioned by name.
CSI Level 3 Michael Keppler (Liev Schreiber, season 7)
- Keppler worked with the CSI team of Las Vegas on the graveyard shift, filling in for Gil Grissom, who had gone on sabbatical. He had shot and killed a man accused of raping his lover, Amy, in Philadelphia and had since moved away to Baltimore, then to Las Vegas. Amy's father, Frank, got mixed up in the shooting of a police officer and blackmailed Keppler into letting him go. Keppler subsequently discovered that Frank had raped and killed Amy and framed an innocent man for the crime. While confronting Frank, Keppler was shot protecting both a prostitute and Catherine Willows. He dies in an ambulance minutes later. His death left the CSI team, particularly Catherine, who had a tighter connection with him than her colleagues, devastated.
CSI Level 1 Ronnie Lake (Jessica Lucas, season 8)
- Ronnie first appeared during season 8 to be the trainee partner of Sara Sidle when the latter transferred to swing shift. Lake is very talkative and asks a lot of questions. In the episode "Goodbye and Good Luck", she attempts to get an abused woman into a shelter. When Sara resigns in the same episode, she leaves a note in Ronnie's locker wishing her good luck. The character has not reappeared since that episode, however, nor has any mention of her been made.
DNA Technician Mia Dickerson (Aisha Tyler, season 5)
- With Greg Sanders's transfer into the field in Season 5, Mia took over the DNA lab. Many lab techs had a crush on her, most notably David Hodges. She had a compulsive personality, once telling Greg that she refused to eat food prepared by others because people cook while they talk and the food ends up being tainted with DNA.
Questioned Documents Technician Ronnie Litre (Eric Stonestreet, seasons 1-5)
- Ronnie is the questioned documents technician from seasons 1-5, who is fascinated by the technology that he uses. In "Revenge Is Best Served Cold" (Season 3, Ep.1) he is asked to assist Gil Grissom in an experiment to investigate the purpose of a tinted contact lens worn by a female professional poker player. He is asked to identify marked aces in a reversed deck of cards and asks how many aces there are. He asked that question either because he did not know how many aces there were in a deck of cards or because he may have suspected that Grissom was trying to trick him.
Fingerprint Technician Charlotte Meridian (Susan Gibney, seasons 1-2)
- Charlotte was a fingerprint technician. In the pilot episode, we found out that Charlotte once dated Gil Grissom, but the relationship cooled off when Grissom discovered that Charlotte did not share his passion for Pink Floyd.
Dr. Jenna Williams (Judith Scott, season 1)
- Dr. Williams was a medical examiner in the Crime Lab who appeared before Dr. Albert Robbins.
Consultant Specialist Teri Miller (Pamela Gidley, seasons 1-3)
- Teri was a forensic anthropologist called in by Gil Grissom's team several times throughout season one of CSI: Crime Scene Investigation to assist with their investigation. She first appears in the sixth episode of first season where she reconstructs a woman's face from a skeleton and mould in order to identify her. The next time she appears is in the fourteenth episode, "To Halve and to Hold," where she helps Grissom and Catherine Willows to piece together a skeleton found in the desert. At the end of the episode, she goes out with Grissom on a romantic dinner date. However, Grissom is called away to a crime scene and before he can apologize to Teri, she is gone. She later appears in the seventeenth episode, "Face Lift," where she uses age progression software to identify a missing girl. During the episode, Grissom asks Teri if they will have dinner again, but she is uninterested. She appears again in the penultimate episode of season one, "Evaluation Day," where she identifies a headless body as a gorilla, not the human they had first assumed it to be. In season 3, she appears again in "Snuff" to reconstruct the face of another skeleton, which turns out to be a boy with Down's syndrome. In this episode, Grissom discovers that Teri had since gotten married, ending any hope of a romantic relationship between the two of them.
Consultant Specialist Prof. Rambar (Tony Amendola, seasons 1 & 6)
- Professor Rambar was the Forensic Document Examiner who analyzed the writing on the bathroom stalls in "I-15 Murders". He appeared again for two episodes in Season 6: "Secrets and Flies" and "Pirates of the Third Reich".
Las Vegas Police Department
LVPD: Sheriff Conrad Ecklie (Marc Vann, seasons 1-)
- A former day shift supervisor, promoted to Assistant Director in season 5. He is known for his strict adherence to regulations, and takes on more of the role of a bureaucrat and politician. He also appears to be quite ambitious and career-minded and a vigorous self-promoter; thus, he has received praise from senior city and county officials on several occasions. Ecklie and night shift supervisor Gil Grissom have a very rocky relationship throughout the series, with Grissom claiming Ecklie is more concerned with advancement than evidence, and Ecklie maintaining that Grissom shows favoritism toward his subordinates. In season 9, Ecklie was promoted to Undersheriff, following the arrest of former Undersheriff McKeen for the murder of Warrick Brown. In season 13, he accepts a promotion to Sheriff.
LVPD Homicide Detective Lou Vartann (Alex Carter, seasons 4–6 & 10-)
- Detective Vartann is a recurring homicide detective. He has a son and is divorced ("The Panty Sniffer"). He believes Las Vegas has no history because history in Vegas gets imploded ("Bang-Bang"). In Season 10, it is shown that there is something going on between him and Catherine Willows, although neither character says so. They are seen having sex during Season 11 and even consider moving in together.
LVPD Homicide Detective Carlos Moreno (Enrique Murciano, seasons 10, 12-)
- Moreno is former Detective Sam Vega's stepson. He has a good working relationship with the CSIs, especially Stokes. His street smarts and local knowledge often come in handy during investigations.
- Officer Metcalf is a uniformed officer in the LVPD.
- Officer Akers is a uniformed officer in the LVPD.
- Officer Mitchell has appeared in many episodes, occasionally being given lines of dialogue. When the CSI team is investigated regarding allegations of racism following a shoot-out with a Hispanic street gang ("A Bullet Runs Through It, Part 1"), Mitchell arrives at the scene of the shootout in progress and says sardonically to an injured gang member who is begging for help, "I don't speak Spanish." He was one of the police officers shot at by Mark Powell in "the Fallen". However, he recovered from his injuries.
LVPD Sheriff Sherry Liston (Barbara Eve Harris, season 12)
- Sheriff Liston was the Sheriff of Las Vegas County in season 12. She was present at the opening of the Mob Museum where former-Mayor Goodman was shot. She was determined to see the crime solved quickly, as an assassination attempt looked bad for the city. She later appeared in "Brain Doe", where she and Catherine discussed the latter's demotion and asked how she was doing. She then told Catherine about a nice job opportunity in Washington, and that she had recommended Willows. She comments that it's hard being a woman in law enforcement and that they need to look out for one another. At the end of Season 12, a widespread corruption scandal within the LVPD became apparent, resulting in several deaths, the near-fatal shooting of then Undersheriff Conrad Ecklie, the tentative resignation of CSI Nick Stokes, and the kidnapping of both D.B. Russell's granddaughter and CSI Julie Finlay. Ashamed by these events, Sheriff Liston resigns off screen and is succeeded by a fully recovered Conrad Ecklie in season 13.
LVPD Sheriff Rory Atwater (Xander Berkeley, seasons 4–5)
- Rory was a Sheriff for the LVPD. In "Grissom Versus the Volcano" he was nearly killed in a car bombing while exiting a hotel. The car bomb turns out later to be a completely unrelated event.
LVPD Sheriff Brian Mobley (Glenn Morshower, seasons 1–2)
- As a sheriff he was very politically motivated when in office, and would prefer that Grissom behave more like his day-time counterpart, Conrad Ecklie, who knows how to play politics ("Unfriendly Skies"). Portia Richmond ("Table Stakes") helped the Sheriff get elected, and he wanted to close her case quickly, much to Grissom's annoyance.
LVPD Detective Frankie Reed (Katee Sackhoff, season 11)
- Detective Reed worked closely with Nick Stokes, and is was not very sensitive, which had been working on.
- Sam was a former member of the LVPD's gang unit. He had a son who owns comic book collectibles. In the Season 12 episode "Crime After Crime", Detective Vega murdered a number of people who escaped justice in cold cases (hired by a dying former detective). He was confronted by Brass and Stokes as he attempted to kill his fourth target but was foiled and instead opted for a suicide by cop.
- Ray was a detective who did not understand the science of forensics, referring to the CSIs as the "nerd squad" ("The Pilot").
LVPD Homicide Detective Cyrus Lockwood (Jeffrey D. Sams, seasons 2–3)
- Lockwood was formerly a homicide detective during seasons 2 and 3 before the episode "Inside the Box" where he inadvertently walked in on an armed bank robbery. Lockwood removed his gun so as to save a mother and child, who were also caught up in the robbery, but he was then shot in the back. CSIs later determined he was shot by a sniper from across the street.
LVPD Homicide Detective Chris Cavaliere (Jose Zuniga, seasons 4–6 & 9-10)
- A rough detective who once went so far as to scare a child into confession for the murder of his brother. He sometimes takes pictures of bizarrely murdered people for a scrap book such as a deceased clown left undressed in a tire ("Getting Off"). In "Say Uncle", Cavaliere was injured after lifting a picture rigged to an explosive device.
LVPD Homicide Detective Gabriel Williams (Gabriel Casseus, season 9)
- Williams was a new homicide detective brought in after the shooting of Warrick Brown.
- Paul Millander (portrayed by Matt O'Toole): a serial murderer who posed as a judge, and serves as Gil Grissom's nemesis. Millander is one of only eight murderers to be featured in multiple episodes, the other seven being Tammy Felton, "The Blue Paint Killer", "The Miniature Killer", "The West Siblings", "Dr Jekyll", and "The Dick and Jane Killer". In the pilot episode, Millander's finger prints turn up on the tape-recorder used for the suicide note of Royce Harmon, the first victim. Gil Grissom meets and questions him, and learns that Millander has a company that makes Halloween costumes called Halloweird. He made a mold of his own hand for a particular costume that has a bloody arm with it, and Grissom concludes that that may be how Millander's print got into the crime scene. Someone may have bought the hand and used it as a red herring. In the episode "Anonymous", another suicide is staged and again Millander's prints show up. Grissom still thinks that it is a red herring but toward the end of the episode a homeless man who is used by the killer to deliver a cryptic message to the CSI team describes Millander as the man who approached him. Grissom then realizes that he has been tricked, and that it was Millander all along. Grissom travels to Millander's workplace and finds it empty apart from a stool and an envelope addressed to Grissom. There is nothing written inside the envelope, telling Grissom that he has nothing. The episode ends with Paul Millander going into the CSI headquarters and asking for Grissom. Millander is told that Grissom is not there and as he turns to leave he looks at the surveillance camera and waves. Millander is not seen again until season two, where yet another suicide is staged in exactly the same way as the previous two. The team realizes that Millander targets middle-aged father figures who share a birthday with the anniversary of his father's death. His father was murdered in a staged suicide when he was a child but the authorities ruled it as a suicide because he was unable to give evidence effectively in court, even though he had witnessed the murder. Moreover, the CSI team finds out that Millander was born female—named Pauline Millander—which added to his ineffectiveness as a witness of his father's murder. He underwent sexual reassignment in his youth and as a result his relationship with his mother was a complicated one. The CSI team also finds out that he was leading a double life, one as Paul Millander and the other as the Honorable Judge Douglas Mason. As Douglas Mason, he has a respectable job, a wife, and an adopted son. When Grissom goes to visit him, he claims to not know any Paul Millander and suggests the doppelgänger theory as an explanation as to why they look exactly the same. Grissom takes a sample of Mason's fingerprints after he touches the bars in the prison but later discovers that they are the fingerprints on file for Judge Douglas Mason. It is later discovered that the finger prints belonged to Paul's father. By the end of "Identity Crisis", Grissom finally has enough evidence to arrest Judge Mason/Paul Millander but Millander escapes custody yet again and returns to his home where his mother lives. He kills her and finally ends his own life in the same way he staged the other suicides and in the way his father's suicide was staged, leaving behind a tape with a suicide message on it. Grissom finds him dead in his bath during the very last scene of this episode. It is then found that Millander and Grissom share the same birthday. In the tenth season, his adopted son, Craig Mason, was suspected of being a killer and was ultimately cleared.
- Tammy Felton (played by Brigid Brannagh) was originally named Melissa Marlowe, but was abducted by her babysitter, Mara Felton, and raised by her and her husband Joe. Tammy first appears in the season one episode "Face Lift," where her father, Joe, is found murdered in a shop. Grissom discovers a fingerprint, and matches it to a child that had been kidnapped years before, Melissa Marlowe. Catherine continues to investigate the murder, and Tammy becomes the prime suspect, and surprisingly, age-enhancements of photos of Melissa Marlowe reveal that she is in fact Tammy Felton. Tammy is arrested for the murder of Joe Felton, but her biological parents, the Marlowe's, make bail and Tammy goes on the lam. Tammy returns in season two episode "And Then There Were None," where in disguise, she and several others rob a casino. In the same episode, she is murdered by her accomplice, ending her life on the lam.
- Ex-Undersheriff Jeffrey McKeen (portrayed by Conor O'Farrell) (seasons 5–9, 12–13) was a politically motivated bureaucrat. McKeen approved an elaborate "reverse forensics" deception in "Redrum" where the CSIs would stage a crime scene to draw out a suspect from hiding, although he neglected to consult the district attorney beforehand and almost ruined the case. He held Greg Sanders responsible for the death of Demetrius James, a suspect Greg hit with his car during an attack, despite the fact that Greg Sanders was ruled "excusable". Later, McKeen turns out to have links to organized crime. When a corrupt police officer, Daniel Prichard, frames Warrick Brown for the murder of mob boss Lou Gedda, McKeen attempts to have Warrick put away but Warrick is found innocent. Shortly after, McKeen stops Warrick in his car where Warrick tells him he won't give up until the mole is caught. McKeen shoots Warrick twice in the neck to prevent himself from being tied to the crimes, then calls for assistance, framing Daniel Prichard. Grissom is first on the scene and Warrick dies in Grissom's arms. In the season nine premiere "For Warrick," McKeen is eventually found out, but plans to flee to Mexico with Prichard. Prichard attempts to steal McKeen's weapon and in the altercation, their car crashes off a cliff, killing Prichard. McKeen manages to crawl away where he is hunted down by Nick Stokes. McKeen taunts Nick to kill him, but instead Nick fires "a miss". McKeen is eventually arrested by Jim Brass, and is presumably jailed. In the aftermath of his arrest, Conrad Ecklie, the former day shift supervisor, becomes the new Under-sheriff. He later resurfaces in the final episode of season 12 "Homecoming", where he attempts to get his revenge, orchestrating the kidnapping of DB Russell's granddaughter and the shooting of Conrad Ecklie from his prison cell. In the opening episode of season 13 "Karma to burn", the CSI manage to find Russell's granddaughter and tie the crimes back to McKeen, whilst Ecklie also survived. He is last seen at the end of this episode, where Russell promises to transfer him to higher security prison, ending his reign of terror.
- Dr. Jekyll is the name given to a murderer who appears throughout the tenth season of CSI: Crime Scene Investigation. He is portrayed by Matt Ross. As of the 17th episode of season ten, he is presumed to have murdered three times, as well as to have caused three further deaths through a neurosurgery which caused a victim to have uncontrollable rage. His first crime was an operation on a corpse in episode "Family Affair". He is revealed to be Charlie DiMasa, the son of a restaurant owner. His dreams of becoming a doctor were thwarted by his father (whom he also attempts to kill). His victims were close customers or associates of his father (Charlie called them his "heroes"). In the season ten finale, Dr. Jekyll is discovered to have planted a valve in the artery of his father. While investigating with Dr. Langston and a LVPD officer, Dr. Jekyll shoots and kills the officer while wounding Nick Stokes in the shoulder. After Langston distracts Dr. Jekyll, Nick shoots and kills him while playing dead although his left arm is injured in the process.
- Sqweegel is the name given to an elusive serial killer under the alias "Ian Moone" (I am no one), who wears a skin-tight latex suit. He is portrayed by Daniel Browning Smith. He is a skilled contortionist and acrobat which allows him to fit through the tightest spaces and stay out of sight. His modus operandi is to sneak into his victim's house and sleep under their bed, live in their attic and read their mail. After a few weeks of this, he will come out of hiding and attack his victim with a straight razor, asking them to admit their dark secrets. He will then disappear for a few weeks and return to murder his victims if they have not confessed to their crimes. He kills two of his victims, Ryan Fink and Carrie Jones, and attacks a third, Margot Wilder. He escapes into the night before the CSIs can apprehend him. It was rumored he would return later in season eleven and Anthony Zuiker posted on his Twitter page that it was possible, but by the time season eleven ended, Sqweegel had not yet made any other appearances on the show. Sqweegel is also the villain in the novel Level 26: Dark Origins, the first novel by Anthony Zuiker. Carrie Jones's daughter gave Sqweegel his name, as she traumatically associated him with the sound of the scrubbers in the car wash ("sqweegel sqweegel") where her mother was killed.
- Nathan "Nate" Haskell (born Warner Thorpe), a.k.a. "The Dick and Jane Killer" (sometimes acronymed "DJK"), is a serial killer who has appeared in seasons nine, ten, and eleven of CSI: Crime Scene Investigation. He is portrayed by Bill Irwin. During Langston's lecture in "19 Down", Haskell claims to have been physically abused by his alcoholic father, Arvin Thorpe, every day when he was a child. He only has vague memories of his mother, who was killed by Arvin when Nate was eight years old. It was revealed in Targets of Obsession that Nate carries the MAO-A gene, a gene which, according to some studies, causes a predisposition towards violence. Exactly how long he has known about it is currently unknown to everyone except himself. His first animal kill was a cat, which he killed when he was nine years old. His first human kill was a travelling salesman named Douglas Nathan Haskell, whose identity he partially adopted as his own. He killed him the same way he later tortured his female victims in his room. In the mid-1990s, he became a serial killer. He became known as "The Dick & Jane Killer" when he started targeting couples. None of the female victims were ever found and Haskell later refused to discuss them. He killed a total of at least 14 people in Nevada, Arizona and California (the first couple, the Steiners, were never found). Even though he never held down a single job or filed a tax return during this time (likely because he was living under an assumed name), he could still afford the occasional restaurant visit, earning money by donating blood and semen or taking part in psychological studies. During a restaurant visit, he had a chance encounter with future serial killer Charlie DiMasa. In Reno, he stopped at a sobreity checkpoint. That stroke of luck allowed the authorities to charge him; inside the car, they found blood belonging to a victim, under his fingernails they found DNA from another, a potential murder weapon was found and a witness was able to place him with another one of the victims. When the case went to trial, Haskell initially denied any guilt, but changed his mind and confessed. He was sentenced to life in prison without the possibility of parole and incarcerated in Ely, Nevada. While there, he appears to have gained a kind of cult following (he claims to have "students" everywhere) and was even proposed to a couple of times. In "Meat Jekyll", Haskell is brought to the Las Vegas crime lab after claiming to know Dr. Jekyll's identity. After the case is concluded, he stabs Ray in the back with a shiv made out of his broken glasses. When guards hear it, Haskell is shocked by his electric restraints and beaten. After a brief stay in a hospital, he is taken back to Ely. He reappears in Targets of Obsession, when he is taken to court to be charged with attempting to kill Ray. Several of his female "fans" are present. After being convicted, he switches his inmate badge for that of a minimum security inmate and gets into a transport van in his place. On the road, it is sabotaged by two of his female fans, who kill the guards. After one of the women kills the other, she drives away with Haskell. He reappeared in Father of the Bride, when he kept sending messages to the father of one of his female fans, threatening to kill her. In "Cello and Goodbye", Haskell went to Los Angeles and abducted Gloria Parkes, Ray Langston's ex-wife, and took her to his childhood home and raped and tortured her. When Ray tracked him down to the Thorpe house, where Haskell had tortured and killed his father, he had a confrontation with Haskell that resulted in the latter's death. The season ends in a cliffhanger when Ray is asked by IA whether him killing Haskell was an act of self-defense or murder.
- The Miniature Killer (real name Natalie Davis), a.k.a. "The Miniature Serial Killer", is a fictional serial killer on the CBS crime drama CSI: Crime Scene Investigation. She is portrayed by Jessie Collins. The Miniature Killer was introduced in the seventh season premiere and, after being the main subject for the whole season, was identified in the finale.The key signature of the Miniature Killer’s crimes were meticulous scale models built to reflect each crime scene. The models were either left at the murder site or delivered to someone involved in solving the case. Every detail was accurate, and even used the victim's real blood instead of paint. Every model also contained a hidden picture of a bloodied doll and an item somehow related to bleach. Her victims were killed in widely different manners, including bludgeoning, poisoning, and electrocution. Many of her victims had employed her services as a cleaning lady (paying under the table), and several also had connections to her foster father. Natalie appeared in a season 9 episode when Grissom attended her hearing, where it was decided that she was to be transferred to another jail, and to no longer receive therapy, as it was decided that therapeutic treatment had been successful. She expressed to Grissom the belief that she had changed and that she felt remorse for her actions. After she is taken out, Grissom inspects a loose floor tile in her cell, lifting it up to find a miniature of Natalie hanging from the bottom by its neck, thus suggesting she still plans to hang herself, as per her original plan.
- The Blue Paint Killer (real name Kevin Greer) was a student-turned-professor at Western Las Vegas University. He is portrayed by Taylor Nichols. He would paint a railing on a walking path blue, but the paint was mixed with motor oil to keep it tacky. He'd wait behind a bush next to a water fountain for his victims and would wait for a specific person to wash their hands. In the season three episode "The Execution of Catherine Willows", Greer's accomplice, John Mathers, has been caught and found guilty of the various murders that Greer himself had committed. Mather's execution is interrupted by a last-minute postponement of the judgement. When Mathers was accused, there was no DNA testing, but with the new technology of DNA testing, John Mathers' hair matched with evidence on one of the victims. But the case still wasn't concrete as there was little evidence to link Mathers to all the murders; this is because he was just an accomplice. The case fell to Catherine who, after examining the case, concluded that Mathers was guilty of the murders and was executed. When the execution had been completed, they found a new victim indicating that Mathers wasn't the serial killer. Greer knows of the execution and feels remorse, causing him to lay low for a while before he starts killing again. In the season five episode "What's Eating Gilbert Grissom?", two years since the execution of John Mathers, Gil Grissom is called in to investigate a homicide. The corpse in the university had been shredded in a wood-chipper. Examining the remains found something familiar, traces of blue paint and motor oil, but unlike the other victims, this one was a man. Greer mistook him for one of his victims as the man had long blonde hair and it was a dark night. They find in the garbage with a bad blow up doll in it, which contained a chunk of hair from a previous victim. In the mouth of the doll, there was an artist’s sketch. In the picture, a frightened woman begging for her life in the back of what appeared to be a van and through the van's windows, they could see the logo of an erotic store. They saw a van outside the shop which resembled the one is the sketch, when they opened it they found the body of Debbie Reston. In the shop, they found a comic book filled with stories and images of women being dominated and tortured, the artist’s style matched the sketch of the drawing in the doll, the style of Greer. They discover the paper was printed from was from Greer's university that he worked at. When they go to his house to arrest him they discover he is already at the Police Station waiting to speak to Grissom. In interrogation, he reveals that there is another victim that they need to save, but this is just a ruse. When they go to leave, Greer asks to go to the toilet. When he goes into to the cubicle, he suffocates himself with a plastic bag that he had hidden on him. As an apparent suicide note, he made one of his usual drawings while being questioned in the interrogation room, with the slight difference that when it was folded a certain way, the drawing of a bound girl turned into the face of Grissom, the mouth of which said "Goodbye".
- Hannah and Marlon West (a.k.a. "The West Siblings") are brother and sister duo who are serial killers. They are portrayed by Juliette Goglia and Douglas Smith, respectively. Both of their parents were killed in a car accident about a year prior to "Goodbye and Good Luck" that Hannah graduated from Harvard, and now teaches at the college Marlon attended. The two became close after their parents' deaths. The season six episode "The Unusual Suspect" introduces to Marlon while on trial for the murder of one of his female classmates, Stacey. His sister, Hannah, a child prodigy, takes the stand and confesses that she herself murdered Stacey, not Marlon. The judge grants the prosecution 72 hours to re-examine the evidence before the jury delivers its verdict. In the end, Marlon is found not guilty by the jury. Hannah is set to be prosecuted for Stacy's murder, but before she is imprisoned, she asked to talk to Sara alone. She admits that she did not kill Stacy, and was, in fact, covering for Marlon. In the season eight episode "Goodbye and Good Luck", a broken tooth from the crime scene ties Marlon to the death of Kira Dillinger, since it appears that Kira punched him and embedded a tooth in her hand. Kira, however, had slept with another man that night, and both were high on GHB. It turns out that their sexual lubricant was spiked, and Marlon's fingerprint was on the tube. All the evidence points to Marlon being the murderer, but Sara is convinced that Hannah is the guilty one. She believes that Hannah wants to get rid of Kira to have her brother all to herself. Marlon confesses to Sara that he had Hannah help him spike the lubricant, but he wouldn't have physically harmed Kira. Sara believes him. They try to get Hannah to confess to Marlon privately, but she notices immediately that he's wearing a wire, and avoids answering Marlon's questions directly. When asked why she killed Kira, her response was "Because I love you". Not long after Hannah's visit to her brother's cell, Marlon hangs himself in his jail cell. When Sara arrives at the college campus to bring Hannah the news, Hannah believes that Sara is lying, trying to manipulate Hannah into a confession. When Sara shows Hannah a picture of her deceased brother, Hannah is devastated and breaks down. It is not known whether Hannah was ever charged with Kira's murder.
- Kristine Marie Hopkins (portrayed by Krista Allen): a prostitute who first appears in the first episode ("The Pilot") where she is suspected of drugging a man and stealing his possessions. Nick Stokes investigates the case but makes a deal with Kristy that if she tells him what she used and gives the man his possessions back she can go without a charge. There have been other cases like this which is why Nick wants to know what they're using. During his short conversation with Kristy during this episode he strikes up an instant rapport with her which is to eventually get him into trouble. The next time Kristy shows up is in episode I-15 Murders where she's in trouble again with a security officer at a shop. She specifically asks for Nick to help her out, claiming the security guard spat on her. Again, the chemistry between Nick and Kristy is present and Nick decides to help her out. He takes Kristy's clothing and gets Greg Sanders to run a test on it to find if there is a certain enzyme on it that is in spit. Greg finds that there's a concentration of amylase on her top which proves the security officer spat on her. Kristy thanks Nick and his attraction to her is more than obvious, but they said goodbye at the end of the episode with a quick goodbye-kiss. Kristy re-appears in episode Boom which is still in the first season. Nick sees her on the side of a road having an argument with a man Nick assumes to be a client. He tells the man to back off and drops Kristy back to her home, but Kristy invites him in and their relationship escalates when they eventually have sex. Kristy also tells him that she plans to come off the game and go back to college. The next morning, Nick leaves but as it is his day off goes back to Kristy's house to spend time with her. When he arrives there he finds that the emergency services, and one of the CSI from the day shift, is at her house because she has been murdered. Conrad Ecklie takes the case and since Nick's fingerprints and DNA is at the crime scene considers him a suspect. This seriously endangers Nick's career as if he is arrested he is automatically not allowed to be a criminalist even if he is cleared of all charges later. When things are looking really bad for Nick, Catherine Willows, his colleague takes the case for twelve hours and finds evidence with the help of Greg processing it all quickly, that proves Nick was not the murderer, but that the man originally seen with Kristy assumed to be a client was the killer who earlier tried to frame Nick. Nick speaks to him and it is revealed that the man is actually Kristy's pimp and she was going back to college to recruit more girls, not to gain an education. It is left unsure if this is the truth, but nevertheless Nick pays for a proper burial for Kristy out of respect for her.
- Lady Heather (portrayed by Melinda Clarke): a dominatrix, and later a sex therapist. She appears in several episodes, and, as of season eleven, knows the 2 major characters of the CSI team, Gil Grissom and Raymond Langston.
- Tony Thorpe (a.k.a. The Parking Garage Rapist) (portrayed by Aldis Hodge): In 2000, a woman named Pamela Adler was raped as she was leaving her office late at night. Thorpe had been lying in wait and ambushed Adler beating her until she fell into a coma. Sara Sidle was the primary investigator and found evidence to tie Thorpe to the rape but Adler's coma made a positive identification impossible and Thorpe was released on a technicality. Sidle promised Thorpe she would finally see him arrested. Adler's husband Tom was now left with the responsibility of caring for his ailing wife. In 2008 following a near decade, Tom Adler killed his wife by cutting off her life support. Tom Adler claimed he did so out of desperation as he claimed Thorpe raped Pamela again and even threatening murder. Sidle working with Greg Sanders naturally ran back to Thorpe believing she finally had enough to nail Thorpe for the original rape and now felony murder, but years earlier Thorpe was involved in a gang-related shooting that left him paralyzed. Thorpe had an unintentional alibi and at the conclusion, Tom Adler was arrested instead for murder going to prison and Thorpe remained a free man.