While Monroe’s cause of death was officially established as a barbiturate overdose, apparently Sinatra believed that something more sinister happened to the actor. Read on to see what Oppedisano has to say about that theory and their relationship now. RELATED: How Old 100 Iconic Stars Would Be If They Were Alive Today. Monroe was found dead in her home on Aug. 5, 1962 at age 36. It was determined that she had died of a barbiturate overdose the previous evening. According to History, Los Angeles police said at the time that her death was “caused by a self-administered overdose of sedative drugs.” Oppedisano claims that Sinatra believed that Monroe was actually killed by someone. “Frank believed she was murdered, and he never got over it,” Oppedisano writes in the excerpt. According to Oppedisano, Monroe had reunited with her ex-husband Joe DiMaggio and was scheduled to give a press conference to reveal that they’d gotten back together. But, it was rumored that Monroe was also going to speak about her alleged affairs with John F. Kennedy and Robert F. Kennedy at that press conference. Oppedisano writes, “Frank said she’d never have spilled about the Kennedys because she still had feelings for [Jack].” The writer also claims that Monroe had talked about her relationships with both Kennedy men with Sinatra. “Marilyn told Frank she didn’t understand why they’d shut her out completely” after she stopped being intimate with them, the book reads. Oppedisano writes that “Frank believed if the press conference hadn’t been announced, she would have lived a lot longer.” That’s because he thought that Monroe was killed to silence her about the Kennedys. Supposedly, people close to Sinatra told him about this conspiracy theory. They told Sinatra that Monroe had “been murdered with a Nembutal suppository and Robert Kennedy or the Mob was involved.“ae0fcc31ae342fd3a1346ebb1f342fcb For more celebrity news delivered right to your inbox, sign up for our daily newsletter. Conspiracy theories about Monroe’s death persist to this day with requests having been made over the years for the case to be reexamined. In 1982, the Los Angeles District Attorney’s office concluded that a criminal investigation wasn’t warranted, and in 1985, a grand jury determined that an inquiry into the actor’s death didn’t need to be reopened. Just last year a new series called Cold Case: History, which would delve into the conspiracy theories surrounding Monroe’s death, was announced. RELATED: The Biggest Female Icon Every Year Since You Were Born.
