RFK Jr. Was 'Cruel' About Late Second Wife Mary's Weight Before Her Tragic Suicide: 'It Was Ugly'

The final chapter of Mary Richardson Kennedy's life was dark, as estranged husband Robert F. Kennedy Jr. allegedly tormented her about her weight before she tragically committed suicide.

Investigative reporter Isabel Vincent wrote about their rocky relationship in her new book, RFK, Jr.: The Fall and Rise, set to hit bookshelves on Tuesday, April 14.

RFK Jr., 72, filed for divorce from Mary in 2010 after nearly 11 years of marriage. Their relationship was tumultuous, with Mary allegedly writing in her private diaries that she was "trying to reassure herself" about being "married to a chronic philanderer."

"Bobby was cruel about her weight, telling her that she had squandered her beauty. He would put his arm around her and criticize her. It was ugly," the author wrote.

Another friend alleged Mary was scared of his bullying tactics, but she "fiercely wanted to remain married," the writer said, with a source stating, "It was the Kennedys or nobody."

“He definitely gaslit her and told her that she was crazy," according to a source close to Mary. "That her accusations about other women were fantasies."

Both Mary and RFK Jr. struggled with substance abuse issues and were in 12-step programs at the time.

Mary was found dead by suicide on May 16, 2012, two years after the environmental lawyer filed for divorce,

She was dressed in all-black workout clothes with a rope tied around her neck, hanging from a beam in her garage.

Though RFK Jr. had already moved on romantically with Cheryl Hines, whom he married in 2014, a close friend hinted that Mary's suicide would be a "weight" he'd carry for the rest of his life.

"She told me that she was sorry for everything. ... She said that I was right about everything," RFK Jr. said in a statement one day after her passing, according to a police filing.

At the time of her suicide, RFK Jr. and Mary were in the middle of a divorce and custody battle over their four kids: Conor, Kyra, William and Aidan.

A statement from an unidentified employee revealed that two days before taking her own life, she asked her "to pray for her, because she got more bad news from her lawyer."

An autopsy revealed Mary had antidepressants in her system.