A look at this year's biggest celebrity shockers:

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HEATH LEDGER: When news broke of Heath Ledger's death at 28, the response was a collective, "You're kidding, right?" The "Brokeback Mountain" star died of an accidental prescription drug overdose in January, and many months later, it was still tough to fathom. The Australia-born Ledger left behind a 3-year-old daughter and a bright career. He earned posthumous raves — and Oscar buzz — for his frightening performance as the Joker in the Batman blockbuster "The Dark Knight."