CSI: Crime Scene Investigation physical evidence to solve murders. The team is originally led by Gil Grissom (Petersen), a socially awkward forensic entomologist and career criminalist who is promoted to CSI supervisor following the death of a trainee investigator. Grissom's second-in-command, Catherine Willows (Marg Helgenberger), is a single mother with a cop's instinct. Born and raised in Las Vegas, Catherine was a stripper before being recruited into law enforcement and training as a blood-spatter specialist. Following Grissom's departure during the ninth season of the series, Catherine is promoted to supervisor. After overseeing the training of new investigator Raymond Langston (Fishburne), Willows is replaced by
CSI: Crime Scene Investigation (season 8) CSI: Crime Scene Investigation (season 8) The eighth season of "" premiered on CBS on September 27, 2007 and ended May 15, 2008. The season stars William Petersen and Marg Helgenberger. As the CSIs race to save one of their own ("Dead Doll"), Sara makes a life changing decision ("Goodbye and Good Luck"), and one investigator falls ("For Gedda"), in the eighth season of "CSI". Grissom, Willows and their team investigate a decapitation ("A La Cart"), a demonic possession ("Go to Hell"), the death of a hermaphrodite ("The Case of the Cross-Dressing Carp"), the murder of a slasher actress ("The