Mary-Kate Off the Hook for Drug Inquiry

There will be no pursuit into how Heath Ledger obtained the powerful painkillers that contributed to his overdose death this year. Prosecutors 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."

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. The DEA had obtained a subpoena that could have forced Olsen if she continued to hold out. But the subpoena, issued in April, is no longer valid because it was contingent upon prosecutors pursuing the case, the official said Wednesday. The official added that the case could still be revived if evidence of a crime emerges.

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

Miller insisted this week that Olsen, a former child star on the sitcom "Full House," had already told the government she "does not know the source of the drugs Mr. Ledger consumed."

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