BEDFORD, New York (AP) ― Robert F. Kennedy Jr.’s estranged wife, Mary Richardson Kennedy, who had fought drug and alcohol problems, was found dead in her home Wednesday.

Attorney Kerry Lawrence, who had represented her in a drunken-driving case, said he didn’t know the cause of her death at age 52. An autopsy was scheduled for Thursday.

Police confirmed a body was found on Robert F. Kennedy Jr.’s property in Bedford, north of New York City, but wouldn’t release the dead person’s name.

The former Mary Richardson, a longtime connection of the Kennedy clan, married Robert Kennedy Jr., a prominent environmental lawyer and the son of Sen. Robert F. Kennedy and nephew of President John F. Kennedy, in 1994. The couple had four children, the youngest born in July 2001. Robert Kennedy Jr. also has two children from a previous marriage.

Mary Kennedy was an architect and designer and had overseen the renovation of the couple’s home into an environmentally advanced showpiece. Her family cited her devotion to her children in remembering her.

“We deeply regret the death of our beloved sister Mary, whose radiant and creative spirit will be sorely missed by those who loved her,” the family said in a statement issued by Lawrence. “Our heart goes out to her children who she loved without reservation.”

Neighbor Leslie Lampert, who owns the Cafe of Love restaurant a short drive from the Kennedy home, said Mary Kennedy was “at all times just a lovely individual.”

“She was community oriented,” Lampert said. “She was always kind in our presence.”

Another neighbor, Kim Fraioli, a trauma therapist who lives a few houses down from the Kennedys, said the family was private.

“We left them alone,” Fraioli. “We didn’t have any interaction. I think it’s a tragedy. It’s very sad for their family and the surviving children. My heart goes out to the family.”

At the home on Wednesday, a red brick mansion with a columned porch entrance set in a heavily wooded acreage, police kept media away.