Mary Jo Kopechne
Biography
Mary Jo Kopechne (; July 26, 1940 – July 18 or 19, 1969) was an American secretary, and one of the campaign workers for U.S. Senator Robert F. Kennedy's 1968 presidential campaign, a close team known as the "Boiler Room Girls". In 1969, she asphyxiated when a car driven by Robert's brother, U.S. Senator Ted Kennedy, left a narrow road on Chappaquiddick Island and overturned into Poucha Pond after they had left a party. According to reports, Kennedy left the party at 11:15 p.m. Kopechne's body and the car were not reported missing until the next morning, approximately nine to ten hours later.
Bio from Wikipedia