- After John Sweeny was released from prison after only serving two and a half years he found work quickly. Dunne's mother, Ellen Griffin, started a grievance support group called, "Justice for Victims of Homicide." On the nights that he worked (as a chef) Griffin and other group members would hand out slips of paper to restaurant patrons that read, "The hands that will prepare your meal tonight also murdered Dominique Dunne." He was fired almost immediately.
- A day before she was to guest star on Hill Street Blues (1981), she was badly beaten by her boyfriend. She showed up on the set with bruises on her face; since she was playing an abused teen in the episode, she wore no make-up. The bruises in the episode are real.
- She loved animals, especially unwanted stray animals, and her home became an asylum for a lot of them.
- Poltergeist (1982) is the only theatrical movie in which she appeared.
- Along with Lou Perryman, she is one of two cast members of Poltergeist (1982) to have been murdered.
- Is interred at Westwood Memorial Park (in Los Angeles, California): Section D, #189. This is near her Poltergeist (1982) co-star Heather O'Rourke, who died in 1988 from intestinal stenosis.
- Murdered by her ex-boyfriend, John Thomas Sweeney, just nineteen days before her 23rd birthday.
- Cedars-Sinai Hospital Medical Center, where Dunne died, were adamant in stating that they did not shut off her life-support system.
- First of two co-stars from Poltergeist (1982) to die unexpectedly within a few years of each other, the second being Heather O'Rourke. Dunne at age 22 and O'Rourke at age 12.
- Sister of Griffin Dunne. Their father is novelist Dominick Dunne.
- Her mother requested Dominique's heart and kidneys be transplanted to save lives as they were in good condition.
- Her murderer, John Thomas Sweeney, later moved to the Northwestern USA and changed his name to John Maura.
- She died exactly five months after Poltergeist (1982) came out.
- She was cast as Robin Maxwell in V (1983) and filmed several scenes before she was murdered. After her death, Blair Tefkin was cast in the role. The only footage of her which remains in the miniseries is a shot of her back in the scene in which the Maxwells observe the arrival of the Los Angeles mothership. The miniseries was dedicated to her memory.
- Found work within three weeks of her arrival in Hollywood.
- She was very superstitious and believed in supernatural phenomena.
- John Thomas Sweeney, Dunne's killer, was 26 years old at the time. After being sentenced to 6 years in prison for assault and unintentional manslaughter, he was freed after less than three years.
- Was rehearsing for the mini-series V: The Final Battle (1984) with actor David Packer the night she was murdered. Packer witnessed the deadly fight between her and John Sweeney.
- Loved cooking, foreign countries and languages (Dominique spoke Italian well) and playing baseball.
- Met her boyfriend-turned killer at a party in the Fall of 1981.
- Traveled to Florence, Italy where she studied art and Italian at the Michelangelo- School and at the British Institute.
- Some of her favorite actresses were Julie Andrews, Jane Fonda, Susan Hayward and Natalie Wood. And for actors of her own generation, she liked Kristy McNichol and Timothy Hutton.
- Her mother Ellen died in 1997.
- Drove a blue VW Bug convertible.
- Close friend of Charles B. Wessler from childhood and who was a pallbearer at her funeral in November, 1982.
- Dominique's father was of Irish descent. Her maternal grandmother, Beatriz Charlotte Sandoval, was born in Nogales, Mexico, to a Mexican father, Alfredo Sandoval, and a mother from Wyoming, Clara Mathilda Holler, who was of German and Swedish descent. Dominique's mother's other ancestry was Irish and English.
- She preferred casual clothes like jeans and shirts instead of more fashionable ones.
- Attended Westlake School in Los Angeles, Taft School in Connecticut, and Fountain Valley High School in Colorado.
- Niece of John Gregory Dunne and Joan Didion.
- Cousin of Quintana Roo Dunne.
- She enjoyed reading, going out for sushi and traveling - she had a near-deserted tropical island called Manihi picked out for a dream vacation.
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