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  He most recently appeared in "I'm Not There," in which he played one of the many incarnations of Bob Dylan -- as did Cate Blanchett, whose performance in that film earned an Oscar nomination Tuesday for best supporting actress.
 Ledger was to appear as the Joker this year in "The Dark Knight," a sequel to 2005's "Batman Begins." He's had starring roles in "A Knight's Tale" and "The Patriot," and played the suicidal son of Billy Bob Thornton in "Monster's Ball."
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