She studied ballet, and danced with the New York City Ballet, and was a model.
Darcy"s mother urged her to become a stripper to make a "fast buck". At age 16, she left home and traveled by bus to California. In 1954 she was cast in Rear Window.
She did not even know who Hitchcock was and did not consider herself an actress.
Hitchcock had selected her based on a publicity photo of her wearing a black leotard and green feather boa. In Rear Window, she played one of the neighbors of protagonist L. B. Jeffries (Jimmy Stewart), a wheelchair-bound photographer who passes the time spying on the other tenants of his apartment building.
Her nameless character, who was dubbed "Mission Torso", practiced her dance moves in a skimpy top and a pair of pink shorts with a 21-inch waistband, courtesy of famed costume designer Edith Head. She had no lines in the film.
During filming, Hitchcock asked her what kinds of pie she liked and disliked.
She told him she loathed pumpkin pie. When it came time to film her character"s reaction to finding a strangled dog, he presented her with pumpkin pie served with "crude Cockney jokes" to prompt an adverse response. On the last day of filming, Hitchcock and some of the cast presented her with a cake in the shape of her voluptuous figure.
"lieutenant had the breasts and everything!" she said.
Hitchcock told Darcy that she should get an agent and that if she studied Anton Chekov in Europe, he could make her a movie star when she returned. She ignored both pieces of advice and thought he was joking about the latter.
She was paid $350 for her work in Rear Window and had a sporadic acting career. Her most substantive role was in the Chubby Checker film Don"t Knock the Twist (1962).
She played Madge Albright, a "dancing firestorm" who is part of a brother-sister dance team
She also appeared in the films Women and Bloody Terror (1970) and The Delta Factor (1970). She also had guest appearances on Lee Marvin"s M Squad, the Westinghouse Desilu Playhouse and Mike Connors"s Mannix. Darcy was the subject of the 2004 documentary short film Remembering Mission Torso by director Malcolm Venville.
However, Frank Cady, who appeared as the Thorwalds" upstairs neighbor, survived until 2012 and Harry Landers, who played Mission Lonelyheart"s suitor, is alive as of 2015.
Rand Harper, who played the uncredited role of the honeymooning groom, also survives.
She was said to be the last surviving credited cast member of Rear Window.