
Steven Lloyd Williams (born January 7, 1949) is an American actor. He has been nominated for a Screen Actors Guild Award and one NAACP Image Award.
He is best known for his roles as Captain Adam Fuller on 21 Jump Street, Lt. Jefferson Burnett on CBS's original drama The Equalizer (1989), Det. August Brooks on TNT's short-lived series L.A. Heat, Mr. X on FOX's scifi series The X-Files, Russell "Linc" Lincoln in Linc's, and Rufus Turner in Supernatural.
He appeared as Trooper Mount in The Blues Brothers (1980), Nester in the 1985 sequel film Missing in Action 2: The Beginning, and bounty hunter Creighton Duke in the 1993 horror film Jason Goes to Hell: The Final Friday.
He has also had many guest appearances on television shows including The Dukes of Hazzard, The A-Team, Booker, MacGyver, Veronica Mars, Stargate SG-1, Martin, The Bernie Mac Show, and Criminal Minds.
He is the uncle of cartoonist Aaron Williams.
Description above from the Wikipedia article Steven Williams, licensed under CC-BY-SA, full list of contributors on Wikipedia.

It
2017 · as Leroy Hanlon

Jack the Giant Slayer
2013 · as Master of Secrets

Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)
2020 · as Captain Patrick Erickson

22 Jump Street
2014 · as Commissioner Adam Fuller (uncredited)

The Blues Brothers
1980 · as Trooper Mount

The Call
2013 · as Terrence

Jason Goes to Hell: The Final Friday
1993 · as Creighton Duke

Twilight Zone: The Movie
1983 · as Bar Patron

Better Off Dead...
1985 · as Tree Trimmer

House
1985 · as Cop #4

Corrina, Corrina
1994 · as Anthony T. Williams

Sexual Life
2005 · as Jerry's Father

Velvet Buzzsaw
2019 · as VA Janitor

Walker, Texas Ranger: Trial by Fire
2005 · as Det. Mike Burton

Route 666
2001 · as Rabbit aka Fred

Missing in Action 2: The Beginning
1985 · as Captain David Nester

The Stakelander
2016 · as Doc Earl

Night Class
2001 · as Sheehan