TV's biggest casting changes

POSTED: 01:17 PM PDT Jun 09, 2011    UPDATED: 11:00 PM PST Jan 02, 2013 

Take a look back at some of the more memorable casting changes in the history of television.

William Petersen, CSI
45 / 52
CBS TV Studios

William Petersen portrayed Dr. Gil Grissom on "CSI" from the time it launched in 2000 through the show's ninth season, when he left to focus on stage acting.

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