Take a look back at some of the more memorable casting changes in the history of television.
Although Petersen has returned to the show in guest spots, the lead character in the show became Laurence Fishburne's Dr. Ray Langston ... for three seasons at least.
Library of Congress
iStock / amete
iStock / LawrenceSawyer
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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