Tony Oppedisano is the former manager of Frank Sinatra. In his upcoming memoir, Sinatra and Me: In the Wee Small Hours, he explores some of the conversations he allegedly shared with the \u201cSummer Wind\u201d singer. In one instance, he reveals that Sinatra reportedly believed Marily Monroe was, in fact, murdered. The circumstances behind Monroe\u2019s death remain the subject of debate to this day. Officially, the toxicology report ruled the cause as acute barbiturate poisoning after she\u2019d been found unresponsive in bed in August 1962. Many people, including apparently Sinatra, believed foul play was involved. Tony Oppedisano shares Frank Sinatra\u2019s thoughts on Marilyn Monroe Sinatra and Me: In the Wee Small Hours \/ Amazon Tony Oppedisano\u2019s upcoming memoir is due for release on June 8. It explores his time working with Frank Sinatra, and apparently Sinatra\u2019s musings about Marilyn Monroe\u2019s death and the hotly-debated circumstances behind it. RELATED: Podcast Explores Why Frank Sinatra Refused To Marry Marilyn Monroe Over \u2018Suicide\u2019 Plan An excerpt shared with People revealed from Oppedisano, \u201cFrank believed she was murdered. Part of this belief may come from their history together, though Sinatra claims it never became physical. Indeed, Oppedisano asserted that they \u201cwere close friends but not lovers.\u201d The former manager then delved further into the two stars\u2019 dynamics. The relationship between two icons Monroe lived a gilded and troubled life \/ Everett Collection \u201cFrank felt she was too troubled, too fragile, for him to sleep with and then walk away,\u201d Sinatra\u2019s former manager shared. Indeed, this was a very sensitive point for Monroe, who reportedly shared with Sinatra her distress that partners would sleep with her and then drop all communication when the physical aspect ceased by her arrangement. Reportedly, Frank Sinatra thought very deeply about the death of Marilyn Monro and its related rumors \/ Flickr Sinatra may have also been one of the last people to see Monroe alive, as one of the last pictures of her was taken at Cal-Neva Lodge, partially owned by Sinatra. Oppedisano further claims she\u2019d been there to see her ex Joe DiMaggio, and to attend a major press conference to announce her relationship to the Kennedy brothers, both of whom had wives. In short, he writes in the memoir, \u201cFrank believed if the press conference hadn\u2019t been announced, she would have lived a lot longer.\u201d Even DiMaggio, famously jealous and sometimes violent with Monroe, pointed the blame at the media and Hollywood entertainment industry, saying after her death, \u201cTell them if it wasn\u2019t for them, she\u2019d still be here.\u201d Oppedisano also claims Sinatra\u2019s attorney, Mickey Rudin, who also worked with Monroe, believed she\u2019d been murdered, citing mob boss Sam Giancana and chatter circulating the mafia. Reportedly, Sinatra himself heard about these rumors and felt haunted by them the rest of his life. What do you think happened to the icon?