Oscar-winning actress Patty Duke dies at 69

FILE - In this Aug. 17, 2004 file photo, actress Patty Duke is honored with a star on the Hollywood Walk of Fame in Los Angeles.Duke, who won an Oscar as a child at the start of an acting career that continued through her adulthood, died Tuesday, March 29, 2016, of sepsis from a ruptured intestine. She was 69. (AP)

NEW YORK (AP) — Patty Duke, who won an Oscar as a teen for “The Miracle Worker” and maintained a long and successful career throughout her life while battling personal demons, has died at the age of 69.

Duke’s agent, Mitchell Stubbs, says the actress died early Tuesday morning of sepsis from a ruptured intestine. She died in Coeur D’Alene, Idaho, according to Teri Weigel, the publicist for her son, actor Sean Astin.

Duke, born Anna Marie Pearce, followed on her early success playing the young Helen Keller with a popular sitcom, “The Patty Duke Show,” which aired for three seasons in the mid-1960s. She played dual roles under an unconventional premise: identical cousins living in Brooklyn Heights, New York.

In 2015, she played twin roles again: as a pair of grandmas on an episode of “Liv and Maddie,” a series on the Disney Channel.