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NEW YORK (AP) Federal prosecutors have decided not to pursue a criminal case into how Heath Ledger obtained the powerful painkillers that contributed to his overdose death this year, a law enforcement official said Wednesday.

Prosecutors in the U.S. attorney's office in Manhattan had been overseeing a Drug Enforcement Administration probe into whether the painkillers found in Ledger's system were obtained illegally. But the prosecutors have bowed out "because they don't believe there's a viable target," said the official, who spoke on condition of anonymity because no charges have been filed.