Charmian Carr, who is known for her role as the eldest Von Trapp daughter, Liesl, in “The Sound of Music,” died Saturday in Woodland Hills, Calif. She was 73 and had been suffering from a rare form of dementia.

Born Charmian Farnon in Chicago, she also starred opposite Anthony Perkins in the TV movie “Evening Primrose.”

She left acting after her two films and started a design business, where her clients included Michael Jackson.

Carr wrote two books, “Forever Liesl” and “Letters to Liesl,” and also participated in the “Sound of Music Family Scrapbook.”

She started hosting “Sound of Music” singalongs in 2000, and attended almost all of the shows at the Hollywood Bowl until 2012.

Carr is survived by sisters and brothers Sharon, Darleen, Michael and Brian; children Jennifer and Emily; niece Julie; and four grandchildren, Emma, Derek, William and Tucker.