Marlon Brando
Marlon Brando earned an Academy Award for his role of Don Vito Corleone in the 1972 film The Godfather. Don Vito dies from a heart attack in the first film, but the second film was supposed to feature "new" flashbacks. Brando signed on to do the flashbacks but he never showed up for filming. Instead, they hired Robert De Niro to fill the part and the rest is history.
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