Take a look back at some of the more memorable casting changes in the history of television.
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.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
iStock / damircudic
Warner Bros. Television
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