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When a new murder leads to a connection with an infamous serial killer, Grissom secretly joins the class of well-known criminal pathologist Dr. Raymond Langston, to gain access to the killer and get a crack in the case.
When a popular young singer is found dead outside an infamous Las Vegas nightclub, the CSI team uncovers a link between the present day crime and a murder from over 50 years ago.
The CSI team is shocked and saddened when, after working with Dr. Raymond Langston on the "Dick & Jane" murders, Grissom announces that his time as a CSI has come to an end and offers Langston a permanent position on the CSI team.