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Dominique Ellen Dunne (November 23, 1959 – November 4, 1982) was an American actress. She made her on-screen debut with the television film Diary of a Teenage Hitchhiker (1979) and played recurring roles in the drama series Family (1980) and the comedy series Breaking Away (1980–1981). Her breakthrough role was Dana Freeling in the blockbuster horror film Poltergeist (1982). Afterward, she headlined the Western film The Shadow Riders and guest-starred in one episode of the crime series CHiPs (both 1982). On October 30, 1982, Dunne was strangled by her ex-boyfriend John Thomas Sweeney during an argument on the driveway of her West Hollywood home. She fell into a coma and died five days later on November 4, 1982, at the age of 22. — Source: Wikipedia