Corday appeared as a pinup girl in numerous men's magazines during the 1950s and was the Playmate of the October 1958 issue of Playboy, along with famous model and showgirl Pat Sheehan.
Corday was born in Santa Monica, California. Wanting a career in films, she came to Hollywood while still in her teens and found work as a showgirl at the Earl Carroll Theatre on Sunset Boulevard. Her physical beauty brought jobs as a photographer's model that led to a bit part as a showgirl in the 1951 film Two Tickets to Broadway.
Corday signed on as a Universal International Pictures (UI) contract player. With UI, Corday was given small roles in various B-movies and television series. In 1954 on the set of Playgirl she met actor Richard Long.
Following the 1955 death of Suzan Ball, the first wife of actor Richard Long, Corday began dating Long, and they married in 1957. Through Long's sister Barbara, Corday was a sister-in-law of actor Marshall Thompson. In the early 1960s, Corday gave up her career to devote herself to raising a family. Widowed in 1974, she and Long had three children during their 17-year marriage: Valerie, Carey, and Gregory. Corday has also been a lifelong friend of actor Clint Eastwood, whom she met while working for Universal Pictures.
In 1956, Corday had a recurring role in the ABC television series Combat Sergeant. From 1959 to early 1961, Corday worked exclusively doing guest spots on various television series.
A few years after her husband's death in 1974, Corday's friend Eastwood offered her a chance to return to filmmaking with a role in his 1977 film The Gauntlet. She had a brief-but-significant role in Sudden Impact (1983), where she played the waitress dumping sugar into Harry Callahan's coffee in that movie's iconic "Go ahead, make my day" sequence. And she acted with Eastwood again in Pink Cadillac (1989) as well as in her last film, 1990's The Rookie.