Advocate reports:
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.

The decision comes after recent reports that actress Mary-Kate Olsen was demanding immunity before answering questions about the startling death of her close friend and his drug use. Authorities say she was the first person called by a masseuse who found the 28-year-old Dark Knight actor's lifeless body in his Manhattan apartment. The DEA had obtained a subpoena that could have forced Olsen if she continued to hold out. READ MORE