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) first and only episode of the "CSI" franchise episode not to feature a female lead. <onlyinclude></onlyinclude> CSI: Crime Scene Investigation (season 12) The twelfth season of "" premiered on CBS on September 21, 2011, and ended on May 9, 2012. The series stars Marg Helgenberger, Ted Danson and Elisabeth Shue. The show was moved to Wednesdays at 10:00 p.m. (P/E), following "Criminal Minds". Catherine and Nick adjust to life working under D.B. Russell, following their demotions, while Morgan Brody joins the CSI team ("73 Seconds"), in the twelfth season of "CSI". This season, the team investigate crimes including the murder