So long, farewell, Sound of Music actress Heather Menzies dies, aged 68

American actress Heather Menzies-Urich, who played one of the von Trapp children in the iconic 1965 film The Sound of Music, has died.

Menzies-Urich was 68-years-old.

Menzies' son Ryan Urich told US media his mother had been diagnosed with glioblastoma multiforme about a month ago.

Glioblastoma is one of the most aggressive brain cancers; Urich said his mother's health had decline rapidly in the wake of the diagnosis.

The Von Trapp children from The Sound of Music. Heather Menzies played Louisa, on the very left. Photo: Alamy

The Von Trapp children from The Sound of Music. Heather Menzies played Louisa, on the very left. Photo: Alamy

Urich, Menzies-Urich's son by the actor Robert Urich, said his mother died surrounded by family at home in Canada.

"She was an actress, a ballerina and loved living her life to the fullest," Urich said.

"She was not in any pain but, nearly four weeks after her diagnosis of terminal brain cancer, she had enough and took her last breath on this earth at 7.22pm."

Heather Menzies (white jacket) with other Sound of Music cast members in 2005. Clockwise from top left are Charmian Carr (Liesl), Debbie Turner (Marta), Kym Karath (Gretl), Duane Chase (Kurt), Angela Cartwright (Brigitta), Julie Andrews (Maria von Trapp), Menzies and Nicholas Hammond (Freidrich). Photo: JULIE JACOBSON

Heather Menzies (white jacket) with other Sound of Music cast members in 2005. Clockwise from top left are Charmian Carr (Liesl), Debbie Turner (Marta), Kym Karath (Gretl), Duane Chase (Kurt), Angela Cartwright (Brigitta), Julie Andrews (Maria von Trapp), Menzies and Nicholas Hammond (Freidrich). Photo: JULIE JACOBSON

Though Menzies-Urich had a diverse acting career, the role with which she remained associated her entire life was that of Louisa von Trapp, the 13-year-old daughter of Captain Georg​ von Trapp (Christopher Plummer) in the film adaptation of The Sound of Music.

In the film's iconic scene where aspiring nun Maria (Julie Andrews) is introduced to her seven charges, Menzies-Urich's Louisa is remembered for attempting to impersonate her younger sibling, Brigitta.

Heather Menzies-Urich, second from right, played Louisa von Trapp in The Sound Of Music.  Photo: Supplied

Heather Menzies-Urich, second from right, played Louisa von Trapp in The Sound Of Music. Photo: Supplied