Seth Gilliam (November 5, 1968) is an American screen and stage actor. He is most known as Father Gabriel on AMC's post-apocalyptic series The Walking Dead, first appearing in Season 5. He is also known for his HBO television roles, first as corrections officer-turned-prisoner Clayton Hughes on Oz, and later as Baltimore police detective promoted to Sergeant, Ellis Carver on The Wire. On both of these series, he co-starred with Lance Reddick and J.D. Williams. Another of his major recurring roles was on the TV series Teen Wolf as Dr. Alan Deaton. He had a recurring role during the seventh season of The Cosby Show as Aaron Dexter (boyfriend of Erika Alexander's character Pam), Law and Order: Criminal Intent, and Law and Order: Trial by Jury. He's had a number of guest roles in other shows such as CSI: Miami, Nurse Jackie, Skins, Person of Interest, The Good Wife, and Bull. His feature film credits include his role as Sergeant Steven Altameyer in Courage Under Fire (1996) and Private Sugar Watkins in the action movie Starship Troopers (1997). His other films include Personal Velocity (2002), Did You Hear About the Morgans? (2009), and Still Alice (2014).

Filmography

• 2025Ride or Die — Creon
• Suits LA — Dean Harris
• 2024The Lady of the Lake — Adam Schultz
• The Walking Dead: The Ones Who Live — Gabriel Stokes
• 2023Teen Wolf: The Movie — Dr. Alan Deaton
• 2023The Zombie Wedding — Reverend Harry Crump
• City on a Hill — Jasper Fields
• 2018Change in the Air — Officer Payne
• 2018Police State — Officer Grady
• 2018Silver Lake — Jeff
• Bull — Dr. Poulson
• 2014Still Alice — Frederic Johnson
• The Blacklist — Larry Whitaker
• Elementary — Dr. Ira Wallace
• 2012The Skinny — Testing Van Doc
• Homeland — Chaplin
• Person of Interest — Des Franklin
• Teen Wolf — Alan Deaton
• 2010Betrayed — Roger Waite
• The Walking Dead — Gabriel Stokes
• 2009Did You Hear About the Morgans? — U.S. Marshal Lasky
• Nurse Jackie — Dr. Lindsey
• The Good Wife — Jacob Rickter
• 2009The People v. Leo Frank — Jim Conley
• 2008Sympathetic Details — Raymond
• Damages — Mark Waters
• Criminal Minds — Lyle Johnson
• Law & Order: Trial by Jury — Terence Wright
• 2005The Great New Wonderful — Clayton
• CSI: Miami — Aaron Nolan
• 2002Personal Velocity — Vincent
• The Wire — Ellis Carver
• Law & Order: Criminal Intent — Detective Daniels
• 2000Punks — Marcus
• Oz — Clayton Hughes
• 1997Starship Troopers — Private Sugar Watkins
• 1996Courage Under Fire — Stephen Altameyer
• 1996Tar — Tyrone
• 1995Heading Home — Willie
• 1995Jefferson in Paris — James Hemings
• 1994Assault at West Point: The Court-Martial of Johnson Whittaker — Cadet Johnson C. Whittaker
• 1993Joey Breaker — Jeremy Brasher
• 1993Mr. Wonderful — Emergency Room Doctor (unconfirmed)
• 1992In the Eyes of a Stranger
• Law & Order — Michael´s Attorney, Babatunde Amoda
• The Cosby Show — Aaron Dexter
• Stakeout (Short)

Appearances as themselves (3)

• 2007Tapping the Wire — Self
• 2007The Wire Odyssey — Self
• 2007The Wire: The Last Word — Self