Heath Ledger
Heath Ledger's role as the Joker in The Dark Knight landed him an Oscar for Best Supporting Actor, but Ledger died before he got to claim the award. He passed due to an accidental drug overdose in January 2008 at 28 years old. In the years after his death, it was speculated that the mental exhaustion of prepping for the part had contributed to Ledger's early ending. Members of his family disagree with this concept—but it's hard to deny that Ledger's Joker wasn't terrifying to watch.
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