Thief (1981) (credited as William L. Peterson)
To Live and Die in L.A. (1985) ... Richard Chance (credited as William L. Petersen)
Manhunter (1986) ... Will Graham
Amazing Grace and Chuck (1987)
Long Gone (TV movie) (1987)
Cousins (1989)
Young Guns II (1990) ... Pat Garrett
Passed Away (1992)

He is usually credited without his middle initial (i.e. credited as "William Petersen" and not "William L. Petersen"). Because his role in Manhunter was so emotionally exhausting, he did everything he could to rid himself of Will Graham after finishing principal photography. He shaved off his beard, cut his hair and dyed it blonde. He also claims to have done this because, while rehearsing for a play in Chicago, his dialogue was always coming out Will Graham; he dyed his hair so he could look in the mirror and see a different person.[3] In a move perhaps indicative of his career choices, Petersen declined a part in Oliver Stone's Platoon, as it would have kept him in the Philippines, away from his family. Instead, he worked on the 1987 made-for-TV movie Long Gone.

Young Guns II.

To Live & Die in L.A.

The skulls......2000
the contender........''

Young Guns II

The Contender (2000)