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TWIN-DICATED

Mary-Kate Olsen, whose role in the accidental drug overdose death of actor Heath Ledger has been vexingly unclear, got another free pass from an official inquiry, The Post has learned.

The Manhattan US Attorney’s Office closed its probe into Ledger’s Jan. 22 death without any charges being filed – and won’t enforce a grand jury subpoena against the 22-year-old twin troll, a source told The Post.

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“They’re closing down the case – at least their part of it,” the source said yesterday of the agency’s extraordinary move.

The decision by federal prosecutors will force the Drug Enforcement Administration to find another agency to investigate if it wants to get to the bottom of Ledger’s death, the source said, adding that the feds could approach the city’s Office of the Special Narcotics Prosecutor.

The US Attorney’s Office declined to comment.

It’s a huge victory for Mary-Kate and her lawyer.

The DEA has been trying to find the source of the drugs that killed Ledger, most of which were legally prescribed in El Paso, Texas, and Los Angeles. The drugs included the painkillers oxycodone and hydrocodone.

Everybody connected with Ledger and his death was interviewed and cooperated – except Olsen.

She declined to cooperate, and insisted on immunity in return for talking.

On Monday, Olsen’s lawyer, Michael Miller, said in a statement the former “Full House” star had “nothing whatsoever to do with the drugs found in Heath Ledger’s home or his body, and she does not know where he obtained them.”

He did not return calls for comment last night.

The NYPD also let Mary-Kate skate.

Once the death was ruled an accidental overdose, cops decided not to try to talk to Olsen – despite the fact she was the first person called by Ledger’s masseuse when he was found dead.

The DEA was not so bashful and opened an investigation to see where the drugs originated.

The agency even obtained a grand-jury subpoena, but hadn’t served it, hoping Olsen would speak to feds in a less confrontational atmosphere.

murray.weiss@nypost.com