Carr had been suffering from a rare form of dementia and she breathed her last in Woodland Hills, California, reported Variety.
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."
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.
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