Episode 616, "Cause And Effect" Tue, Aug 5, 1|12c AM
SEASON 6, EPISODE 613 - The team searches for a serial killer who is targeting men who solicit prostitutes. Also, Colby and Nikki deal with the aftermath of a car crash when they have an accident during the investigation. Tony Hale ("Arrested Development," "Chuck") Reprises His Role as Eccentric Biotech Professor Russell Lazlo. Guest Stars Include Clea DuVall ("Heroes," "Carnivle") as Melanie Bailey, the Sister of a Murdered Prostitute, and Anna Camp ("True Blood") as Escort Siouxsie Dark.