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
Kitty (CSI: Crime Scene Investigation) boxset. The episode had 9.95 million viewers. CBS confirmed that the episode also broke the Guinness World Record for largest TV simulcast drama episode, airing in 171 countries, including digital streaming on CBS All Access. Kitty (CSI: Crime Scene Investigation) "Kitty" is an episode of . Kitty introduced FBI Agent Avery Ryan from which this episode served as the backdoor pilot of the series. Despite being credited Jorja Fox and Jon Wellner who portray Sara Sidle and Henry Andrews do not appear in this episode (although the latter does appear in a deleted scene). The episode begins with a house's