Law of Gravity

S7 E15: Grissom returns from his teaching sabbatical as new member of the team Michael Keppler desperately tries to keep his dark past hidden from his colleagues. As a result, he fails to disclose that he not only knows Frank McCarty (Len Cariou), the retired police officer who reportedly found the remains of his cop friend and a prostitute in a Las Vegas hotel room, but that Frank may have had a role in the murders. (TV-14)