Patty Duke Is Dead at 69 By Michael Rothman Lesley Messer Mar 29, 2016, 12:38 PM ET Albert L. Ortega/Getty Images Patty Duke attends The Hollywood Show 2014 held at Westin LAX Hotel, April 12, 2014, in Los Angeles. Share Email Patty Duke died this morning, ABC News has confirmed. According to her rep, Mitchell Stubbs, the cause of death was sepsis from a ruptured intestine. The actress, whose real name was Anna Pearce, was 69. "She was a wife, a mother, a grandmother, a friend, a mental health advocate and a cultural icon," Stubbs added in a statement. "She will be greatly missed."