TV's biggest casting changes

Published On: Jun 09 2011 03:17:17 PM CDT   Updated On: Apr 16 2014 01:00:00 AM CDT

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

Sam Waterston, Law & Order
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NBC Universal Television

Sam Waterston stepped in to play the new executive assistant D.A. Jack McCoy and would stick with the show through the rest of its 16 seasons.

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