Take a look back at some of the more memorable casting changes in the history of television.
As Harrison's character was gradually phased out during season six, in came nurse Terri Alden, played by Priscilla Barnes, who would stay for the show's final three seasons.
MTV via CNN
Mark Sagliocco/Getty Images
Cody Hough/Wikimedia Commons
Frazer Harrison/Getty Images
USDA FSIS via CNN
HRH The Duchess of Cambridge via CNN
Joe Raedle/Getty Images
Rick Diamond/Getty Images for CMT
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