William Petersen
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"William Louis Petersen" is an American actor and producer, best known for playing Gil Grissom/Dr. Gilbert "Gil" Grissom on the hit CBS series CSI: Crime Scene Investigation, Richard Chance in the film To Live and Die in L.A. (film)/To Live and Die in L.A., and Will Graham in the film Manhunter (film)/Manhunter.

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