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The actor's eyes filled with tears as he spoke of his regret on learning of Ledger's sudden death on Tuesday.
Day-Lewis, who was supposed to be discussing his Oscar nomination for There Will Be Blood, said he felt "strange" talking about anything else.
He explained: "I hope you don't mind if I speak about this, Oprah... I feel very unsettled at the moment. I only just heard the news about Heath Ledger.
"There isn't anything to say other than to express one's regret to his family and his friends. I didn't know him. I have a strong impression I would have liked him very much as a person if I had.
"I had already marvelled at some of his work. And looked forward to the work he would do in the future."
He added that he prayed Ledger's loved ones would be left alone to grieve, saying: "This is going to be something they are going to be living with for the rest of their lives.”
> Obituary: Heath Ledger
