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Federal investigators want to question Mary-Kate Olsen about how Heath Ledger got two powerful painkillers that contributed to his accidental overdose death, but she's refusing to talk without immunity, a law enforcement official said Monday.

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The official confirmed a report that Olsen wants a promise of immunity from prosecution before speaking to the Drug Enforcement Administration. Olsen was a close friend of Ledger's, and was the first person called by a masseuse who found the 28-year-old "Dark Knight" actor's lifeless body in his Manhattan apartment.

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DEA investigators suspect the painkillers oxycodone and hydrocodone found in Ledger's system were obtained with phony prescriptions or other illegal means, the official said. Oxycodone is sold as OxyContin; and hydrocodone as Vicodin.