Seamus Dever

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Seamus Dever
Seamus Dever (edited).jpg
Seamus Dever at Paley Center for Media September 2013
Seamus Patrick Dever

(1976-07-27) July 27, 1976 (age 45)
Years active1999–present
(m. 2006)

Seamus Patrick Dever (born July 27, 1976) is an American actor known for his role as Detective Kevin Ryan in the ABC series Castle.

Early life[edit]

Dever was born in Flint, Michigan, and moved at the age of 6 to Bullhead City, Arizona, where he grew up.[1] He graduated as valedictorian of Mohave High School, completed his undergraduate studies at Northern Arizona University, and holds MFAs in Acting from the Moscow Art Theatre and Carnegie-Mellon University.[2]

Personal life[edit]

A lifetime member of the Actors Studio, Dever married the future Juliana Dever on May 27, 2006.[3] Juliana played Jenny Ryan, Ryan's wife, on Castle.[4] He is a cousin of Broadway actress Jeanne Arnold and Canadian singer-songwriter Feist.[5]

Dever and his wife are vegetarians.[6] Both are also supporters of Best Friends Animal Society.[6]

Dever also starred in a celebrity episode of The Chase (American game show), Season 3 (2014), where he scored 11 questions in the preliminaries, and led a team with Dean Cain to defeat the Chaser, Mark Labbett.



Year Title Role Notes
2001 Shooting LA Colin
2002 Monkey Love Aaron Miles Credited as Séamus Dever
2002 Outside the Law Rick Michell
2006 Hollywoodland Phillip
2008 Affairs in Order Cyrus
2008 The Essence of Depp Dylan
2009 Ready or Not Marc
2014 Sequestered Obama Short film
2015 The Extraordinary Farewell H. Henry Locke


Year Title Role Notes
1999 Pensacola: Wings of Gold Lewis 1 episode: "Behind Enemy Lines"
2001 She's No Angel Cricket TV Movie
2001 Undressed Randy 1 episode: "Episode #4.1"
2001 Crossing Jordan Tom Murch 1 episode: "Believers"
2003 Without a Trace Ronald Phelps 1 episode: "Moving On"
2004 Cold Case Hank Dempsey 1 episode: "The House"
2005 Mystery Woman: Snapshot Billy TV Movie
2005 JAG Caden Duran 1 episode: "San Diego"
2005 Charmed Mitchell Haines 1 episode: "Freaky Phoebe"
2005 McBride: The Doctor Is Out...Really Out Allan TV Movie
2005 Threshold Agent Detoro 2 episodes: "Trees Made of Glass: Part 2", "Blood of the Children"
2005 CSI: Crime Scene Investigation Adam Gilford 1 episode: "Bite Me"
2006 CSI: NY Charles Cooper 1 episode: "Live or Let Die"
2006 NCIS Graham Thomas 1 episode: "Singled Out"
2007 Close to Home Justin Matthews 1 episode: "Making Amends"
2007 CSI: Miami Paul Billings 1 episode: "Kill Switch"
2008 General Hospital Dr. Ian Devlin 45 episodes
2008 Mad Men Chuck 1 episode: "For Those Who Think Young"
2008 Army Wives Dr. Chris Ferlinghetti 7 episodes
2008 Ghost Whisperer Rich Henderson 1 episode: "Save Our Souls"
2008 CSI: Crime Scene Investigation Drew Rich 1 episode: "Young Man with a Horn"
2009 Drop Dead Diva Tyler Mack 1 episode: "The Dress"
2009–2016 Castle Detective Kevin Ryan Main cast
173 episodes
Nominated—People's Choice Award for Favorite TV Bromance (shared with Jon Huertas)
2010 Dark Blue Nick Perry 2 episodes: "Dead Flowers", "Personal Effects"
2012 Chelsea Lately Kevin Ryan in Castle 1 episode: "Episode 6.187 (Himself playing his Castle character)"
2014 The Chase Himself 1 episode: "Starry Eyed: Celebrity Episode"
2018 Legion Don Eichman 1 episode: "Chapter 14"
2018 Take Two Todd Garlin 1 episode: "Death Becomes Him"
2018–2019 Titans Trigon Recurring
3 episodes
2019 The Rookie Chaz Bachman Episode: "The Bet"
2020 NCIS: Los Angeles Alexi Gonchgarov Episode: "Russia, Russia, Russia

Video games[edit]

Year Title Role
2002 Soldier of Fortune II: Double Helix Additional voices
2018 Far Cry 5 John Seed


  1. ^ "Q&A with Flint-born Seamus Dever, a.k.a Det. Kevin Ryan on ABC's "Castle"". mlive. February 27, 2012. Retrieved June 10, 2020.
  2. ^ "Biography - Seamus Dever | The Official Site". November 11, 2018. Archived from the original on November 11, 2018. Retrieved June 13, 2020.
  3. ^ "Castle's Seamus Dever Compares His Real Wedding to His TV Wedding".
  4. ^ Matt Richenthal (January 6, 2012). "Seamus Dever on Castle wedding episode, grappling over donuts". Retrieved February 25, 2013.
  5. ^ "Seamus Dever's Twitter". October 4, 2011. Retrieved February 25, 2013.
  6. ^ a b "An Actor of Character". Vegetarian Times. 38 (396, number 8): 20. September 2012.

External links[edit]