Charmian Carr passed away at 73 after complications from a rare form of dementia, her representative said.

Remarkably, she is known for a single movie role: that of Liesl, in The Sound of Music. 

Carr wrote two books on her experience – Forever Liesl and Letters to Liesl – and frequently appeared at events commemorating the movie.

Her only other major role was in the Stephen Sondheim television musical Evening Primrose.