Filmography
- Thief (1981) (credited as William L. Peterson)
- To Live and Die in L.A. (1985) ... Richard Chance (credited as William L. Petersen)
- The Twilight Zone (1986) Ep. 21a, Need To Know ... Edward Sayers
- Manhunter (1986) ... Will Graham
- Amazing Grace and Chuck (1987)
- Long Gone (TV movie) (1987)
- Cousins (1989)
- The Kennedys of Massachusetts (1990)
- Young Guns II (1990) ... Pat Garrett
- Hard Promises (1991) ... Joey (Credited as William L. Peterson)
- Passed Away (1992)
- Keep the Change (TV) (1992)
- Return to Lonesome Dove (mini series) (1993) ... Gideon Walker
- Curacao (1993)
- In the Kingdom of the Blind, the Man With One Eye Is King (1995) ... Tony C.
- Fear (1996) ... Steve Walker
- The Beast (1996) (made for TV movie) ... Whip Dalton
- 12 Angry Men (1997) (TV) ... Juror #12
- Gunshy (1998) ... Jake Bridges
- The Staircase (1998) ... Joad
- The Rat Pack (TV) (1998) ... John F. Kennedy
- Kiss the Sky (1999) ... Jeff
- The Skulls (2000) ... Ames Levritt
- The Contender (2000) ... Gov. Jack Hathaway
- CSI: Crime Scene Investigation (2000–2009, 2011) ... Dr. Gilbert "Gil" Grissom In 193 episodes
- Without a Trace (2007) episode Where and Why crossover with CSI as Gil Grissom
- Detachment (2011) ... Sarge ...
- Seeking a Friend for the End of the World (2012) ... Trucker
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