8) Marissa Cooper (The O.C.)

Mischa Barton played Marissa Cooper for three seasons on The O.C. Barton faced challenges on set, including reports of on-set bullying. She cited a toxic work environment as a factor in her decision to leave. Producers offered Marissa a potential return, but Barton declined. The character’s death in a car accident shocked viewers. Her exit significantly changed the show’s tone in later seasons. Barton stated leaving the show was necessary for her mental health. Fans criticized the decision, feeling Marissa’s departure left a void in the series. Barton pursued other acting opportunities after leaving.
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