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Abruptly departed: Farrah Fawcett, right
Copyright © 2009, The Los Angeles Times
Played: Jill Munroe
Lasted: One year (1976, but came back for guest appearances through 1980)
Why she left: The producers wanted her to stay, but her iconic swimsuit poster catapulted her to worldwide fame. She left to pursue film projects.
How it went down on air: Jill decides to leave the Townsend agency to be a race car driver.