My Fair Lady, The King And I, and West Side Story, in each case, she was behind the scenes, voicing the singing parts for the leading ladies. The New York Times called her "American cinema's most unsung singer." Since she didn't get credit for her parts. Nowadays, that could start a scandal as in the case of Milli Vanilli, a musical act from the 1980s that used uncredited vocalists with behind the good looking "band members" whose voices were not used in their video.
She was also a former Mercer Island resident, who hosted a children's show known as "Boomerang" on KOMO in the late 70s and early 80s. She was the mother of the late pop singer Andrew Gold, who died in 2011. Marni Nixon passed away last Sunday.