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).
Ride or Die
Creon
2025
Suits LA
Dean Harris · (1 episode)
2025
The Lady of the Lake
Adam Schultz
2024
The Walking Dead: The Ones Who Live
Gabriel Stokes · (1 episode)
2024
The Zombie Wedding
Reverend Harry Crump
2023
Teen Wolf: The Movie
Dr. Alan Deaton
2023
City on a Hill
Jasper Fields · (1 episode)
2019
Silver Lake
Jeff
2018
Change in the Air
Officer Payne
2018
Police State
Officer Grady
2018
Bull
Dr. Poulson · (1 episode)
2016
Still Alice
Frederic Johnson
2014
The Blacklist
Larry Whitaker · (1 episode)
2013
Elementary
Dr. Ira Wallace · (1 episode)
2012
The Skinny
Testing Van Doc
2012
Person of Interest
Des Franklin · (1 episode)
2011
Teen Wolf
Alan Deaton · (44 episodes)
2011
The Walking Dead
Gabriel Stokes · (106 episodes)
2010
Betrayed
Roger Waite
2010
Did You Hear About the Morgans?
U.S. Marshal Lasky
2009
The Good Wife
Jacob Rickter · (2 episodes)
2009
The People v. Leo Frank
Jim Conley
2009
Sympathetic Details
Raymond
2008
The Wire: The Last Word
Self
2007
The Wire Odyssey
Self
2007
Tapping the Wire
Self
2007
Criminal Minds
Lyle Johnson · (1 episode)
2005
The Great New Wonderful
Clayton
2005
Law & Order: Trial by Jury
Terence Wright · (4 episodes)
2005
CSI: Miami
(1 episode)
2002
The Wire
Ellis Carver · (35 episodes)
2002
The Wire
Detective Ellis Carver · (12 episodes)
2002
The Wire
Sergeant Ellis Carver · (9 episodes)
2002
Personal Velocity
Vincent
2002
Law & Order: Criminal Intent
Detective Daniels · (4 episodes)
2001
Punks
Marcus
2000
Starship Troopers
Private Sugar Watkins
1997
Oz
Clayton Hughes · (2 episodes)
1997
Tar
Tyrone
1996
Courage Under Fire
Stephen Altameyer
1996
Heading Home
Willie
1995
Jefferson in Paris
James Hemings
1995
Assault at West Point: The Court-Martial of Johnson Whittaker
Cadet Johnson C. Whittaker
1994
Mr. Wonderful
Emergency Room Doctor (unconfirmed)
1993
Joey Breaker
Jeremy Brasher
1993
In the Eyes of a Stranger
1992
Stakeout
Law & Order
Michael´s Attorney · (1 episode)
1990
Law & Order
Babatunde Amoda · (1 episode)
1990
The Cosby Show
Aaron Dexter · (3 episodes)
1984