Before Mary Kennedy was found dead in the barn behind her Bedford, New York, home in May 2012, she handed off her husband's most closely guarded secrets, his private journals, to a confidant, according to investigative journalist Isabel Vincent. The diaries, which Vincent says documented years of Robert F. Kennedy Jr.'s sexual encounters and inner turmoil, surfaced in a plastic shopping bag at a Manhattan restaurant roughly a year after Mary's death and now form a central thread of Vincent's forthcoming book, RFK, JR.: The Fall and Rise, as the Daily Mail reported.
The revelation lands while Kennedy, now 72, serves as U.S. Secretary of Health and Human Services, a role that already subjects him to intense public scrutiny over everything from his agency's policy decisions to his personal conduct. Vincent's book, available for preorder and set to go on sale April 14, promises a detailed accounting of the diaries' contents and the turbulent final years of Kennedy's marriage to Mary.
Mary Kennedy, an architect and mother of four of RFK Jr.'s children, Conor, Kyra, William, and Aidan, died at 52. She was found hanging in the barn at the family's home in Bedford. In the weeks before her death, Vincent told People, Mary gave the journals to a friend "as insurance."
Vincent, a former New York Post reporter who was covering Mary's death at the time, said the journals arrived without warning. She recalled that a plastic shopping bag full of journals and a list of sexual encounters simply appeared on her chair at a Manhattan restaurant about a year after Mary died.
The contents were explicit. Vincent said the diaries included reports of "various sexual encounters with 37 different women." Kennedy reportedly ranked the experiences on a scale of one through ten, "with the highest referring to intercourse." Vincent said the journals "helped me get into his head" and described them as a window into Kennedy's compulsions, grief, and self-examination.
Kennedy himself has acknowledged the diaries' existence. During a 2023 appearance on the Vlad TV podcast, he described them as "my own way of trying to live and examine life." He said Mary had "somehow" gained access to them, telling Vincent in a separate exchange that she "opened a safe."
When Vincent called Kennedy in September 2013 to confront him, his reaction was swift. She recounted the exchange to People:
"I think it was September 2013, and I told him, 'I have seen your diaries and I wanted to ask you about these women.' And there was a silence on the phone. He said, 'You can't possibly have them.' And I said, 'I did.' And he said, 'I'm going to call my lawyer.' And nothing ever happened after that."
Nothing legal materialized. The diaries remained in Vincent's hands, and the book built around them now approaches publication.
Vincent's account paints the final stretch of the Kennedy marriage as a bitter custody fight shadowed by accusations of infidelity. Kennedy began dating actress Cheryl Hines while still legally married to Mary. He married Hines in August 2014, two years after Mary's death. The couple does not share children.
A source quoted in Vincent's book offered a blunt assessment of Kennedy's conduct in the months before Mary died: "He definitely gaslit her and told her she was crazy and that her accusations about other women were fantasies." That claim, attributed to an unnamed source in the book, has not been independently verified.
Vincent herself framed Mary's decision to take the diaries as an act born of desperation rather than malice. She told People that Mary viewed the journals as "some kind of leverage" during the couple's disputes. But Vincent also offered a more sympathetic reading, writing that "in many ways she was trying to reassure herself that she had been married to a chronic philanderer for nearly 20 years."
The tension between those two framings, leverage and reassurance, sits at the heart of the story. Mary Kennedy was fighting for custody of her children and watching her marriage collapse. The diaries gave her proof of what she suspected. Whether handing them off to a journalist's eventual source was a strategic move or a final act of self-preservation is a question Vincent's book raises but may not fully resolve.
RFK Jr. has lived most of his adult life in the public eye. The son of assassinated Attorney General Robert F. Kennedy Sr. and nephew of President John F. Kennedy, he grew up in a family defined by tragedy and political ambition. He has spoken openly about his heroin addiction, claiming 43 years in recovery. He has been married three times, first to Emily Ruth Black, with whom he shares two children, Robert III and Kathleen, then to Mary, and now to Hines.
His political journey has been no less turbulent. Once a prominent Democrat, Kennedy broke with the party, mounted an independent presidential campaign in 2024, and ultimately joined Donald Trump's cabinet as HHS Secretary. His public statements on health policy and personal matters have drawn constant media attention.
Vincent's book also touches on Kennedy's relationship with Olivia Nuzzi, a 32-year-old New York Magazine reporter who revealed she became "emotionally involved" with Kennedy while writing a feature on his 2024 presidential campaign. Kennedy denied any inappropriate relationship with Nuzzi.
The pattern that emerges from Vincent's reporting, and from Kennedy's own admissions about the diaries, is one of a man who meticulously documented his private life while building a public persona around family legacy, environmental activism, and now federal health policy. The gap between those two versions of RFK Jr. is what gives the diary story its force.
Several questions hang over Vincent's account. The identity of the confidant who initially received the diaries from Mary has not been publicly disclosed. It is unclear how the journals traveled from that person to Vincent's chair at a Manhattan restaurant. Kennedy's threat to call his lawyer produced no visible legal action, which raises its own questions about why he chose not to pursue the matter.
The book's claims rest heavily on Vincent's own testimony and the unnamed sources she interviewed. Whether additional corroboration surfaces after publication will shape how the story is received. In an era when leaked personal communications can reshape political careers overnight, the stakes for Kennedy are real.
Vincent, for her part, seemed to view Mary Kennedy's role in the story with genuine sympathy. She told People that despite everything, Mary still looms large in Kennedy's life:
"People told me she was the love of his life. And Mary still occupies a very important part of his life, even though she's dead."
That line captures something the political class rarely acknowledges: the human wreckage left behind when powerful men treat their private lives as disposable. Mary Kennedy died at 52, in a barn behind a house where she raised four children. She left behind diaries that were not hers, but that told her story more honestly than anything her husband ever said in public.
The broader pattern is familiar to anyone who has watched political families fracture under the weight of ambition and secrecy. What makes this case distinct is that the evidence was handed off deliberately, by a woman who knew she was running out of options.
Vincent's book will test whether the public cares about the private conduct of a man now running a federal agency that touches every American's health. The diaries exist. Their contents have been described in detail. Kennedy acknowledged them on a podcast and threatened legal action that never came. Those are the facts.
What voters and taxpayers do with them is another matter, but they deserve to know what kind of man is making decisions on their behalf. Accountability doesn't stop at the office door, no matter whose last name is on it.