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 12) a house ("Stealing Home"), a crippling blackout ("CSI Unplugged"), a murder at an Alice-in-Wonderland style wedding ("Malice in Wonderland"), and a race-truck explosion ("Dune and Gloom"). Later, the troubles continue for the CSI's personal lives, as Finn and D.B. struggle to come to terms with their past relationship, Ecklie is gunned down, Nick leaves CSI, and the Crime Lab is placed under the supervision of an outside agency ("Homecoming"). Ted Danson and Elisabeth Shue join the main cast, replacing Laurence Fishburne, and the outgoing Marg Helgenberger, respectively. Elisabeth Harnois becomes a series regular. Episode 13 of the season is the