ACTRESS Charmian Carr, who found fame in the classic film The Sound of Music, has died aged 73 after suffering from dementia.

She played the role of Liesl Von Trapp, the eldest daughter in the musical family, alongside Julie Andrews and Christopher Plummer, winning hearts for her performance of the song Sixteen Going On Seventeen in the Academy Award- winning film.

She wrote two books about her experiences, titled Forever Liesl and Letter to Liesl.

Ms Carr's spokesman, Harlan Boll, said she died in Los Angeles of complications from a rare form of dementia.

Born in Chicago in 1942, Carr was the daughter of Rita Oehmen, a vaudeville actress, and Brian Farnon, a musician and orchestra leader.