|Born||Moose Jaw, Saskatchewan, Canada|
|Notable works||The One Who Got Away|
Twitchell was convicted of first degree murder in 2011 for killing John Brian "Johnny" Altinger. The criminal investigation and first-degree murder trial drew substantial media attention due to Twitchell's having taken inspiration from the fictional serial killer Dexter Morgan.
In fall of 2008, computer company contractor Gilles Tetreault logged on to the dating website plentyoffish.com and met someone he believed to be a young woman named Sheena. On October 3rd, Tertreault entered a garage in Edmonton expecting to pick Sheena up for a date. Instead he was attacked by a man wearing a hockey mask and wielding a stun baton. After a violent struggle, he escaped, but did not report the attack to police. One week later, Johnny Altinger was murdered after being lured to the same address and attacked in the same way. Mark Twitchell, the man found guilty of Altinger’s murder, was an aspiring filmmaker and a fan of the hit TV show ‘Dexter’. In his short film ‘House of Cards’, Twitchell wrote of a male killer luring a cheating husband on the pretense of a date with a woman, forcing personal information from him before stabbing and dismembering the man. During their investigation, homicide detectives seized a diary written by Twitchell, and which prosecutors assert is a generally accurate representation of what happened to Mr. Altinger.
Tetreault has made several media appearances related to his experience, including:
- Dateline NBC - Deadly House of Cards - Aired on NBC 
- 48 Hours Mystery – Screenplay for Murder - Aired on CBS 
- The Fifth Estate - MURDER, he wrote - Aired on CBC 
- I Survived - Biography Channel 
- Dates from Hell – Web of Seduction - Aired on Investigations Discovery 
- The Security Brief – Script for Murder - Aired on REELZ 
- "Alleged first victim recalls his escape". CTV News. 2011-04-01. Retrieved 2011-04-01.
- "Jury finds Edmonton filmmaker guilty of murder". The Globe and Mail. 2011-04-12. Retrieved 2011-04-12.
- "Michael C. Hall, 'Dexter' Star Horrified By Mark Twitchell Case". The Canadian Press. 2012-12-14. Retrieved 2012-12-14.
- "Bio: Gilles Tetreault". The Edmonton Journal. 2011-04-02. Retrieved 2011-04-02.
- "'Date' turned into fight for life, man tells murder trial". CTV News - The Canadian Press. 2011-04-01. Retrieved 2011-04-01.
- "'Reliving his fantasy': 'Dexter Killer' still allowed to watch ultra-violent TV series in maximum-security prison". National Post. 2013-05-05. Retrieved 2013-05-05.
- "Mark Andrew Twitchell's Macabre House of Cards". True Crime Report. 2008-11-01. Retrieved 2008-11-01.
- "Read: Document from Mark Twitchell's laptop". Edmonton Journal. 2011-07-03. Retrieved 2011-07-03.
- "Twitchell trial: Alleged victim recounts fight for his life". Toronto Sun. 2011-04-01. Retrieved 2011-04-01.
- "The One Who Got Away". tetreault.org. 2015-07-05. Retrieved 2015-07-05.
- "Twitchell attempted murder charge stayed". The Edmonton Sun. 2015-06-17. Retrieved 2015-06-17.
- "Deadly House of Cards". Dateline NBC. 2011-09-16. Retrieved 2011-09-16.
- "Screenplay for Murder". 48 Hours Mystery - CBS News. 2012-02-11. Retrieved 2012-02-11.
- "MURDER, he wrote". The Fifth Estate - CBC. 2011-11-18. Retrieved 2011-11-18.
- "Inside The Mark Twitchell Case". True Crime Canada - CBC. 2013-09-10. Retrieved 2013-09-10.
- "I Survived... - Gilles/Angela and Richard/Jeffrey". Biography Channel - IMDb. 2012-10-21. Retrieved 2012-10-21.
- "Dates from Hell - Web of Seduction". Investigations Discovery - IMDb. 2012-07-25. Retrieved 2012-07-25.
- "Dates From Hell: Online Dating Gone Wrong As Would-Be Serial Killer Poses As Woman To Lure Victims". HuffPost TV. 2012-07-26. Retrieved 2012-07-26.
- "The Security Brief – Script for Murder". The Security Brief. 2016-01-13. Retrieved 2016-01-13.