Boston: Julia Thorne, the former wife of Senator John Kerry who turned her experience with depression into a best-selling book, has died of cancer. She was 61.

Thorne died on Thursday at a friend's home in Concord, Massachusetts, the senator's office said.

Thorne, who struggled with depression for much of the 1980s, also founded a nonprofit education foundation called The Depression Initiative.

In 1993, she wrote You Are Not Alone: Words of Experience and Hope for the Journey through Depression, with Larry Rothstein. A second book, A Change of Heart: Words of Experience and Hope for the Journey through Divorce, was published in 1996.

"She was a phenomenal mother," daughter Vanessa Kerry told The Boston Globe.

"And she affected many others, too. So many people have come up to me over the years, even on the campaign trail, to say how much of a difference her books made for them."

John Kerry called Thorne "a great friend to a lot of people. She was the best mom two daughters could want," he said.