Charmian Carr, who played the eldest Von Trapp daughter, Liesl, in the 1965 classic The Sound of Music, has died at age 73.

CHARMIAN CARR, SOUND OF MUSIC ACTRESS, DIES AT 73

Carr had been suffering from a rare form of dementia, and died in Los Angeles after related complications. Carr gained fame from her role as Liesl, in which she famously performed “Sixteen Going on Seventeen.”

Carr also starred alongside Anthony Perkins in the Stephen Sondheim TV musical Evening Primrose. After just two films, Carr left the acting industry.

She went on to run her own interior design firm, and wrote two books about her role as Liesl, entitled Forever Liesl and Letters to Liesl. Carr also often attended screenings of the film, and hosted her own Sound of Music singalongs in 2000.

The real life Liesl, Agatha von Trapp, passed away in 2010 at the age of 97.

Celebrities and fans alike took to Twitter to show their appreciation for Carr and sorrow for her passing. Kym Karath, who played Gretl von Trapp in the film said, “She has been like a sister throughout my life.”

See her iconic Sound of Music performance below.

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