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CSI: Crime Scene Investigation

CSI: Crime Scene Investigation (CBS) Returns: Thursday, April 3 at 9:00 pm ET So Far This Season: Gil Grissom (William Petersen) and Catherine Willows (Marg Helgenberger) and their team of crime scene investigators have solved some mighty tricky crimes. In Las Vegas. Oh and Sara's (Jorja Fox) gone. When It Returns: Not even the flu can stop Grissom when the CSI team has to help DDA Klein (Bonnie Bedelia) figure out why several of her key witnesses keep being bumped off before they reach grand jury. William Petersen on 'CSI: Crime Scene Investigation' photo courtesy of CBS