Gil Grissom

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Dr. Gilbert Arthur "Gil" Grissom, Ph.D., is a fictional character on the CBS crime drama CSI: Crime Scene Investigation, portrayed by William Petersen. Grissom was a forensic entomologist and the night shift supervisor of the Clark County, Nevada CSI (forensics) team, investigating crimes in and around the city of Las Vegas. He was the show's protagonist from seasons one to nine, when Petersen left the show as a regular, and was replaced by Laurence Fishburne as Dr. Raymond Langston, M.D. He appeared in 190 episodes.