She’s off the hook!

The U.S. Attorney’s Office has closed its investigation into Heath Ledger’s accidental overdose death and will not enforce a subpoena against Mary-Kate Olsen.

The investigation was closed without any charges being filed.

The federal probe focused on how he obtained Oxycontin and Vicodin, two powerful and often-abused painkillers for which Ledger had no prescription.

Masseuse Diana Wolozin found Ledger lying on his bed shortly after 3 p.m., and called Olsen three times, records show. The longest call lasted one minute and three seconds.

Olsen, 22, was subpoenaed by a federal grand jury on April 23, but her attorney had been in negotiations with federal authorities since then, the source said.

Olsen had wanted immunity before testifying. Olsen’s attorney released a statement saying the actress “had nothing to do” with Ledger’s drugs and had already provided “relevant information” to investigators.

The U.S. Attorney’s Office and Olsen’s rep both declined to comment.

Hmm…Mary-Kate is lucky.  She seemed to be sweating it out about the investigation.  Something is still shady about the whole situation.

Possibly shady?

Mary-Kate Olsenhas refused to be interviewed by federal investigators from the U.S. Drug Enforcement Agency who are probing Heath Ledger’s accidental drug-related death. She is lawyered up and won’t talk unless she receives immunity from prosecution, which is her constitutional right.

Why does the 4-foot-11, 90-pound Olsen need immunity?

The New York Post is reporting that MK’s lawyer, Michael Miller, has repeatedly rebuffed the feds’ attempts to talk to Olsen, who was called by her masseuse after the woman discovered Ledger’s unresponsive body in his SoHo apartment in January 2008.

Everyone involved with Ledger — doctors, the masseuse, bodyguards, housekeepers, even Michelle Williams, the mother of his baby daughter, Matilda — has already cooperated and been questioned.

Olsen is reportedly the last witness needed to conclude the investigation into where Heath got the drugs and medicines that caused his accidental death.

The cause of death was determined to be an overdose of sleep-aid medications, prescribed by two doctors, and of a powerful painkiller, OxyContin, from an unknown source.

Investigators want to find out where Heath got the OxyContin.

If Mary-Kate can help investigators get to the bottom of this, shouldn’t she help?

Asked whether he asked for immunity for his client, Mary-Kate Olsen’s lawyer told the Post, “We are not going to comment on whether there is a criminal investigation,” and declined to speak further.

Last night, Mary-Kate Olsen was a guest on Dave Letterman’s show.  She was promoting her new movie, The Whackness.  Mary-Kate also revealed that she went to high school with Spencer Pratt, from The Hills.  She talks about his bad temper.  It’s pretty amusing.  Check out the video below.  Also, what is up with Mary-Kate Olsen’s body language.  It is just so weird and awkward. 

Oh, and you know that Spencer is LOVING all of this attention!

Mary-Kate Olsen turns heads in a chic satin romper during the afterparty for the film 21 at New York’s Mercer Kitchen.

Doesn’t Mary-Kate look so much healthier these days?  Cute outfit and I love her hair too!

Add author to Mary-Kate and Ashley Olsen’s ever-growing resume.

The 21-year-old twins, who topped last year’s Forbes Top Earning Stars Under 21 list with an estimated fortune of $40 million each, are publishing a coffee table book titled Influence, through Penguin Young Readers Group.

It will feature “the most interesting, challenging, creative people we know — the ones who helped pave the way for us and our generation,” Ashley said in a statement.

Among them: shoe guru Christian Louboutin, actress Lauren Hutton, photographer Terry Richardson and writer Bob Colacello.

“Ashley and I interviewed the people who have inspired us, with the hope that they will inspire and teach others,” Mary-Kate said.

The book — due this fall — will also feature exclusive photos of the twins and never-before-seen interviews with the two.

I thought the always caffeinated twins would come out with their own coffee before a coffee table book.  I love artistic coffee table books, so I think I will have to check it out in the fall.

According to People, Mary-Kate Olsen and Heath Ledger had casually dated for three months prior to Heath’s death.   The pair first met in the summer of 2006 when Ledger was living at Chateau Marmont in Hollywood. (At that time Heath was still involved with Michelle Williams, the mother of their daughter, Matilda, now 2-years-old.)

The source in People states, “They were hooking up, but neither were particularly interested in making it exclusive.”

As for what drew the two together, says the source, “They had a bond that was based on partying, and they had the same tastes in partying … like, in terms of where they liked to hang out in New York, what time they would want to go out. They just had the same sensibility.”

Read between the lines, people.

At the time of their first becoming acquainted – the summer after Ledger’s Oscar nomination for Brokeback Mountain – Ledger and Olsen were spotted together having lunch at the Chateau with a group of friends, and Ledger was described as being charmed by Olsen, who made him laugh as he would scarf down a big meal.

“Mary-Kate made him laugh a lot,” an eyewitness recalled.

Both the New York Post and Daily News reported this week that Ledger, 28, and the Olsen twin, 21, were dating.

Linked By a Phone Call

Whatever their relationship, the two were again linked when reports surfaced that Mary-Kate received two phone calls from masseuse Diana Wolozin, who arrived for an appointment at the actor’s New York City apartment on Tuesday only to find him dead in his bedroom.

Wolozin, aware that Ledger and Olsen were friends, used the speed dial on Ledger’s cell phone to call Olsen in California to ask for help, sources said. Olsen told the masseuse she would call her security people in New York to assist in the matter.

Things were far more carefree back in the summer of ‘06, “They were all talking about scripts and telling funny stories about directors and people in the biz,” remembers the eyewitness. They also shared something else in common: Both smoked Marlboro Reds.