Heath Ledger. Hurts, but he could have done so much more
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damnyoutuesday:
I wouldn't call it "squandered", but man, what his career could've been always gets the mind running. Hell, what The Dark Knight Rises with the Joker returning could've been is enough to think about. He definitely would've had some damn good roles in some damn good movies. His Joker role was probably going to just vault his career to new heights. Damn shame that he died way too young.