Marilyn Monroe was heard having sex with President JFK & Bobby Kennedy in secret recordings at beach house, doc ...

A PRIVATE investigator revealed how he heard Marilyn Monroe having sex with President John F Kennedy and brother Bobby during their secret rendezvous.

Talking in an interview that was shared in a new documentary, The Mystery of Marilyn Monroe: The Unheard Tapes, John Danoff, says he was hired by a rival to dig up dirt on the Kennedy brothers.

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He claims to have installed listening devices in the actress' home as well as the beach house at the home of John and Robert's brother-in-law, Peter Lawford.

Peter and their sister Patricia Kennedy Lawford were renowned for holding wild parties where Marilyn would meet the brothers in private at the couple's beach house in Palm Springs.

Speaking about the secret recordings, Danoff said: "I'm beginning to recognise the voices, the Bostonian accent and Marilyn Monroe.

"I heard the President call Marilyn, 'Marilyn', or Marilyn calling the President the 'Prez'.

Fred Otash, the investigator who worked with Danoff adds: "There were numerous tapes made on Marilyn and Jack at the beach house in the act of loving making.  

"They went into the bedroom where there was another transmitter, which picked up cuddly talk and taking off her clothes, the sex act in the bed." 

He also describes how they heard 'arrangements for meetings' with not just Jack but brother Bobby, who visited the star's home many times.

He adds: "There were more tapes made out of Robert Kennedy and Monroe as opposed to Jack Kennedy and Monroe."

John Danoff was employed by private investigator and ex-cop Fred Otash, known as one of the best in the business.

Otash was in turn hired by a rival of the Kennedy brothers, union leader Jimmy Hoffa, a famously corrupt man who was well connected to the Mafia.

Hoffa was furious after being targeted by Attorney General Robert Kennedy over his illegal activities and was desperate to dig up dirt on the brothers.

Otash explains how Marilyn's home as well as the Lawford's Palm Springs property and beach house was bugged.

Talking in the tapes, he says: "They were placed under the carpets, in the chandeliers and in the ceiling fixtures."

The Lawfords held some of Hollywood's most famous parties attracting Hollywood's rich and famous.

Peter was a member of Frank Sinatra's Rat Pack and married the Kennedy's sister Patricia in 1954.

Dean Martin and his wife Jeanne were regular visitors and she described Peter as a 'pimp' for the Kennedy's.

She said: "They would do it just as soon in front of anybody.

"Yeah, their wives would be in the other room...I mean, I've had a hand up my breasts.

"The President owned it."

BOMBSHELL DOC

The latest documentary reveals unheard interviews from those close to the Hollywood superstar before and after her tragic death on August 4, 1962.

The suspicious circumstances around her death have lead to countless conspiracy theories - despite coroners ruling her death as probable suicide.

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The doc also explores who the actress was with during her final days and the extent of the Kennedys' involvement.

Monroe allegedly had romantic links with JFK and his younger brother Robert but, both men refused to commit as they were married with children.

She also told columnist and writer Sidney Skolsky that she was in a relationship with Bobby's brother John and that the two were intimate on several occasions.

In the days leading up to her death, sources claimed Monroe told confidants that she was pregnant with one of the Kennedy's children, but she was forced to "lose the baby."

The bombshell doc also revealed documents that suggested Monroe was privy to nuclear government secrets that made her a threat to the Kennedy family and the country's national security.

'CLOSE RELATIONSHIP'

Robert Kennedy claimed to have been nowhere near Monroe's home on the day she died but witnesses have placed him at her property before she passed.

JFK was assassinated in November 1963 and years later, Robert Kennedy was also assassinated in June 1968.

In the week leading up to her death, Monroe spent a lot of time making phone calls to old friends and acquittances.

She called her gynecologist Dr. Leon Krohn to ask if he was angry with her about a previous miscarriage.

She also phoned her friend, real-estate agent Arthur James, to discuss her possible impregnation by one of the Kennedys.

The day before her death, she called her long-time friend Anne Karger to say she was going to marry Bobby Kennedy.

She also called friends in Washington to try and reach Bobby, including Robert Slatzer and Kennedy's brother-in-law Peter Lawford.

On the morning of her death, she called actress Jeanne Carmen, who told Vanity Fair, that Monroe sounded distressed.

"She said some woman had been calling all night, harassing her and calling her names,” Carmen said.

“The voice sounded familiar, but she couldn’t put a name to it. The anonymous caller had said words to the effect 'Leave Bobby alone, you tramp. Leave Bobby alone.'"

Carmen also said that Monroe asked for sleeping pills and wine, but Carmen declined her request.

Later the day of her death, a friend, Agnes Flanagan showed up at Monroe's home.

At 4.30pm, Monroe phoned her psychiatrist who came to her home until 7.00pm.

Her psychiatrist told LA suicide watch professionals that he had "had calls that morning and by the time I saw her she was in a rage.

She had recently had sexual relationships with "extremely important men in government...at the highest level", the doctor claimed.

Monroe allegedly said that she was supposed to see one of those men that night, and was angry that the plans fell through.

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At 9.30pm, Monroe called her hairdresser Sydney Guilaroff.

Guilaroff told Vanity Fair that "Marilyn telephoned me in despair. She rambled on about being surrounded by danger, about betrayals by ‘men in high places,’ about clandestine love affairs.”

CONSPIRACY THEORIES FLOURISH

Sounding frantic, she told Guilaroff that Robert Kennedy had been at the house that very day, “threatening me, yelling at me.”

Between 9.30 and 10pm, Monroe talked to screenwriter Jose Bolanos, who he claims, learned something about Monroe that "will one day shock the whole world."

He has never shared what that information is.

Sometime before midnight that evening, Monroe died by apparent suicide.

Investigators for the Los Angeles district attorney reviewed Monroe's cause of death in the 1980s but found themselves blocked by the FBI.

Decades later, her official cause of death still hasn't been established, allowing conspiracy theories to flourish.

One wild theory includes the notion that she was killed by the FBI at the instruction of the Kennedys.

Conspiracy theorists allege this was either to hide their affairs, or cover up secret government secrets that they may have shared with Monroe.

The book Dirty Secrets: UFO Conspiracies and the Mysterious Death of Marilyn Monroe claims the actress was murdered because she was deemed a national security threat.

Monroe was said to be murdered by the US government "because of her being told Government secrets … One of them being about crashed UFOs and strange dead bodies held at military bases,” said author Nick Redfern, as reported by WFMZ-TV.

Other rumors claim that the actress was killed by the mafia.

The Netflix Documentary The Marilyn Monroe Mystery of Marilyn Monore: The Unheard Tapes, is now available to watch.