Federal Prosecutors have decided NOT to pursue official charges into the death of Heath Ledger. The Feds decided not to pursue a criminal case into how he 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 D.E.A. 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.

Looks like potential “viable target” Mary-Kate Olsen is off the hook…for now. Wonder how much THAT cost! The DEA had obtained a subpoena that could have forced Olsen if she continued to hold out. The official added that the case could still be revived if evidence of a crime emerges. MK has been stonewalling investigators, and it looks like for now, it’s paid off.

Rebekah Carmichael, a spokeswoman for the U.S. attorney’s office, said it’s the office’s policy to “neither confirm nor deny the existence of an investigation.” There was no immediate response to a message left for Olsen’s attorney, Michael C. Miller.

DEA investigators suspect the painkillers found in Ledger’s system, oxycodone (Oxycontin)and hydrocodone, were obtained with phony prescriptions or other illegal means.

Snarkista thinks its possible that Mary-Kate could have been involved. Oxy suppresses appetite in many users, and MK has been in rehab for anorexia and is rumored to have had treatment for substance abuse. Her bodyguards had plenty of time to get evidence out of Heath’s apartment, although it would probably have been hard to trace back to her. Unless someone else knew she provided the drugs.

If so, no one is talking, and the lil’ bag lady can sleep a little easier tonight. The Feds can and will reopen the investigation if any pertinent evidence comes to light. Dodged a bullet, Trollsen.

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