Heather Menzies-Urich (December 3, 1949 – December 24, 2017) She was a Canadian-American model and actress, known for her roles as Louisa von Trapp in the 1965 film The Sound of Music and Jessica 6 in the TV series Logan's Run. Menzies' first appearance on-screen was in 1964, when she appeared in the TV series The Farmer’s Daughter. Menzies was cast in The Sound of Music as Louisa, the third-oldest of the von Trapp children, at the age of 14, with no prior acting experience. The songs Menzies performed in the film include "So Long, Farewell" and the "Lonely Goatherd". Menzies went on to appear in a number of television series such as T. J. Hooker, Dragnet, Bonanza, Marcus Welby, M.D. and The Bob Newhart Show. She also starred as Jessica 6 in the short-lived TV series Logan's Run. In addition, Menzies was cast in Hawaii, How Sweet It Is!, Hail, Hero!, Piranha, and Endangered Species. Menzies married John Cluett in 1969 and divorced in 1973. She married ...