Charmian Carr, an actress who had a single but indelible role in the movies as Liesl, the von Trapp daughter who was "16 going on 17" in the Rodgers and Hammerstein musical "The Sound of Music ...

Charmian Carr, who died on Saturday and was best known for her role as Liesl in The Sound of Music. A spokesman for the actress said she died from complications stemming from a rare form of dementia.

Charmian Carr, the actress best known for sweetly portraying the eldest von Trapp daughter in Rogers & Hammerstein’s “The Sound of Music,” has died. She was 73.