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
Law of Gravity (CSI: Crime Scene Investigation) Law of Gravity (CSI: Crime Scene Investigation) "Law of Gravity" is the fifteenth episode of the of the television series "". Before the start of his shift, Keppler eats dinner at a diner where he runs into an older man named Frank McCarty. Frank, who appears to know Keppler from New Jersey, asks Keppler for a favor, but Keppler quickly says no before Frank can explain. The CSIs are called to a hotel room where a man and a woman have been shot and killed; the woman's left hand has been cut off. Brass informs them the man is Dennis