Take a look back at some of the more memorable casting changes in the history of television.
In 2011, Steve Carell stepped away from his "The Office" role as Michael Scott, a part he had played since 2005, to do movies full time.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
iStock / damircudic
Warner Bros. Television
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