Federal Investigators Drop Ledger Drug Inquiry

** FILE ** This image provided by Focus Features shows actor Heath Ledger portraying the character Ennis Del Mar in the movie "Brokeback Mountain." Locals in Heath Ledger's hometown of Perth, Australia on Monday February 4, 2008, prepared to welcome home the remains of one of their biggest stars, mourning the death of the 28-year-old Oscar-nominated actor _ and expressing dismay at the recent speculation about his alleged drug use. (AP Photo/Focus Features) ** NO SALES **
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New York (AP) A law enforcement official says federal prosecutors have decided not to pursue a criminal case into how Heath Ledger got the powerful painkillers that contributed to his overdose death last january.

Federal prosecutors in New York had been overseeing a drug enforcement administration probe into whether the painkillers found in ledger's system were obtained illegally.

But the law enforcement source says prosecutors have bowed out because they don't think there's a “viable target.”

The decision comes after recent reports that actress Mary-Kate Olsen was demanding immunity before answering questions about the death of her friend and his drug use. Authorities say Olsen was the first person called by a masseuse who found Ledger's lifeless body in his New York apartment.

A lawyer for the former child star says Olsen has told the government she doesn't know where Ledger got the drugs.