Oscar winner Patty Duke has died at the age of 69, passing away from a ruptured intestine. The actress won an Academy Award for Best Supporting Actress at age 16 for her performance as Helen Keller in 1962's The Miracle Worker, a role she originated on Broadway, before going on to become the star of The Patty Duke Show, which ran from 1963 to 1966. She continued to act in films and television, earned 10 Emmy nominations and three Emmy awards, and served as president of the Screen Actors Guild from 1985 to 1988. She was also a longtime advocate for mental health, after being diagnosed with bipolar disorder in 1982. She is survived by her sons Sean and MacKenzie Astin, both actors in their own right, her other son Kevin Pearce, and her three granddaughers.