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 explicitness of graphic violence, images, and sexual content. The "CSI" series and its spin-off shows have been accused of pushing the boundary of what is considered acceptable viewing for primetime network television. The series had numerous episodes on sexual fetishism and other forms of sexual pleasure (notably the recurring character of Lady Heather, a professional dominatrix). "CSI" was ranked among the worst primetime shows by the Parents Television Council from its second through sixth seasons, being ranked the worst show for family prime-time viewing after the 2002–2003 and 2005–2006 seasons. The PTC also targeted certain "CSI" episodes for its weekly