Trivia

Her performance as "Helen" in The Panic in Needle Park (1971) is ranked #76 on Premiere Magazine's 100 Greatest Performances of All Time (2006).

Granddaughter of General George C. Marshall, wartime Chief of Staff in World War II--he was her mother's stepfather. She later sold the painting "A View of Tinherir" by Sir Winston Churchill which had been given to Gen. Marshall by the famous British Prime Minister; the painting sold at auction for $1.2 million (11 December 2006).

Winn initially retired in 1978 upon getting married and having a child, but briefly returned to acting in 1982, doing some television. After one last acting role, a guest spot in Partners in Crime (1984), she permanently retired from acting to focus on raising her family.

Winn came out of retirement for a one-time occasion to do a stage performance in 2011, by playing the lead in The Last Romance at the San Jose Repertory Theatre. She was nominated for a best actress award by the San Francisco Bay Area Theatre Critics Circle.

Portrayed Ophelia in a star-studded 1972 NY production of "Hamlet" starring Stacy Keach Colleen Dewhurst and James Earl Jones.

She has appeared in one film that has been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: The Exorcist (1973).

Namesake of her grandmother, Katherine Tupper Marshall, wife of George C. Marshall.

Has a child with her husband Morton Winston.