Charmian Carr, the actress who starred as Liesl von Trapp in The Sound of Music, died on Saturday, September 17, 2016. According to a statement by her family, Carr died due to complications from a rare form of dementia. She was 73 years old.

Carr was 21 years old when she played the eldest von Trapp child in the 1965 film adaptation of The Sound of Music. Featuring Carr’s lovely performance of “Sixteen Going on Seventeen,” the movie won five Academy Awards, including Best Picture and Best Director for Robert Wise. It was nominated for another five Oscars.

Carr was born in Chicago, Illinois in 1942. Her family moved to Los Angeles when she was 10 and she was active in several sports during high school. Interestingly, she had not tried acting or had singing lessons when she signed on for The Sound of Music.

Her only other acting credit was for the TV movie Evening Primrose in 1966.

She left Hollywood to focus on her family and business. She ran an interior design business with some celebrity clients, such as Michael Jackson. She also wrote the books Forever Liesl about her time filming The Sound of Music and Letters to Liesl focused on fan mail that had been sent to her over the years.