Day-Lewis, 50, dedicated his award to 28-year-old Heath Ledger who was found dead in his New York apartment last week. The actor, who won an Oscar in 1990 for My Left Foot, said he had never met Ledger but paid tribute to him, saying: "In Brokeback Mountain, he was unique, he was perfect. That scene in the trailer at the end of the film is as moving as anything I think I've ever seen."