Why Did Grissom Leave CSI?:Gil Grissom (William Petersen)
Why Did Grissom Leave CSI?:Gil Grissom (William Petersen) – Why Did Grissom Leave CSI? Grissom left CSI to be with Sara Sidle.William Petersen aka Gil Grissom left the show to pursue other things such as theater but he will be coming back from time to time.
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