Sean Penn gets the Best Actor Oscar

Sean Penn, who made a career of tackling dark roles, won the best actor honour for his role of a grieving father in Mystic River

Former Hollywood "bad boy" Sean Penn, who made a career of tackling dark, grittier roles, won the best actor Oscar on Sunday for his portrayal of a tortured, grieving father in "Mystic River."

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The outspoken actor who has long spurned Hollywood's traditions, won the Academy Award with his fourth nomination, following nods for "Dead Man Walking," "Sweet and Lowdown" and "I Am Sam."