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).
TBAStakeout as Unknown
2025Ride or Die as Creon
2025Suits LA (1 Episode) as Dean Harris
2024The Lady of the Lake as Adam Schultz
2024The Walking Dead: The Ones Who Live (1 Episode) as Gabriel Stokes
2023The Zombie Wedding as Reverend Harry Crump
2023Teen Wolf: The Movie as Dr. Alan Deaton
2019City on a Hill (1 Episode) as Jasper Fields
2018Silver Lake as Jeff
2018Change in the Air as Officer Payne
2018Police State as Officer Grady
2016Bull (1 Episode) as Dr. Poulson
2014Still Alice as Frederic Johnson
2013The Blacklist (1 Episode) as Larry Whitaker
2012Elementary (1 Episode) as Dr. Ira Wallace
2012The Skinny as Testing Van Doc
2011Person of Interest (1 Episode) as Des Franklin
2011Teen Wolf (44 Episodes) as Alan Deaton
2010The Walking Dead (106 Episodes) as Gabriel Stokes
2010Betrayed as Roger Waite
2009Did You Hear About the Morgans? as U.S. Marshal Lasky
2009The Good Wife (2 Episodes) as Jacob Rickter
2009The People v. Leo Frank as Jim Conley
2008Sympathetic Details as Raymond
2007The Wire: The Last Word as Self
2007The Wire Odyssey as Self
2007Tapping the Wire as Self
2005Criminal Minds (1 Episode) as Lyle Johnson
2005The Great New Wonderful as Clayton
2005Law & Order: Trial by Jury (4 Episodes) as Terence Wright
2002CSI: Miami (1 Episode) as Unknown
2002The Wire (56 Episodes) as Ellis Carver
2002Personal Velocity as Vincent
2001Law & Order: Criminal Intent (4 Episodes) as Detective Daniels
2000Punks as Marcus
1997Starship Troopers as Private Sugar Watkins
1997Oz (2 Episodes) as Clayton Hughes
1996Tar as Tyrone
1996Courage Under Fire as Stephen Altameyer
1995Heading Home as Willie
1995Jefferson in Paris as James Hemings
1994Assault at West Point: The Court-Martial of Johnson Whittaker as Cadet Johnson C. Whittaker
1993Mr. Wonderful as Emergency Room Doctor (unconfirmed)
1993Joey Breaker as Jeremy Brasher
1992In the Eyes of a Stranger as Unknown
1990Law & Order (1, 1 Episode) as Michael´s Attorney, Babatunde Amoda
1984The Cosby Show (3 Episodes) as Aaron Dexter