A secret FBI report on the death of Marilyn Monroe alleges the tragic star was tricked into killing herself by her associates - including former US attorney general, ROBERT KENNEDY. Monroe, 36, was found lying naked, faced down on her bed at her Brentwood, California home on 5 August 1962. A coroner ruled the cause of death as 'probable suicide' by barbiturate poisoning, but many conspiracy theorists believe her rumoured affair with Kennedy had something to do with her unexpected death. However, the newly-released FBI file - which was uncovered by Australian filmmaker Philippe Mora - suggests the Some Like It Hot star was persuaded to make a suicide bid with the understanding that she would be rescued in time. But the report speculates she was left to die in an elaborate plot which included her psychiatrist RALPH GREENSON, her housekeeper EUNICE MURRAY, her press secretary PAT NEWCOMB and actor Peter Lawford, who was married to Kennedy's sister PATRICIA. The document, which was given to the FBI in October 1964, alleges Lawford "knew from Marilyn's friends that she often made suicide attempts" to gain sympathy. He is accused of making "special arrangements" with Greenson to provide Monroe with the means to commit a drugs overdose. The report says, "Robert Kennedy made a telephone call to Peter Lawford to find out if Marilyn was dead yet. "Marilyn expected to have her stomach pumped and get sympathy for her suicide attempt. The psychiatrist did not come to see her until after she was known to be dead." The file also alleges Monroe was silenced because she had threatened to reveal a "romance and sex affair" with Kennedy, whom she realised would never leave his wife ETHEL for her.