Urich was recently diagnosed with brain cancer and died surrounded by her family, her son Ryan Urich told Variety.
The Rodgers and Hammerstein estate, representing "The Sound of Music" musical creators Richard Rodgers and Oscar Hammerstein, condoled Urich's death and said "Heather was part of 'the family'".
"There is really no other way to describe the members of the cast of the movie of 'The Sound of Music'. And of 'the kids,' Heather was a cheerful and positive member of the group, always hoping for the next gathering.
Urich was born in 1949 in Toronto. Her first acting credit was on the TV series "My Three Sons" at the age of 13.
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She then auditioned and got the part of Louisa the third-oldest von Trapp sibling in 'The Sound of Music', which also starred Julie Andrews and Christopher Plummer.
The film went on to become a beloved classic and won five Oscars, including best picture.
Urich was married to film producer Robert Urich until his death in 2002.
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