Dominique Dunne was a rising American actress who was strangled by her ex- boyfriend, John Thomas Sweeney, outside her West Hollywood home on October 30, 1982; she fell into a coma and died five days later at age 22.

Quick Scoop

Who was Dominique Dunne?

  • American actress best known for playing the older sister, Dana Freeling, in the 1982 horror film Poltergeist.
  • Born November 23, 1959, in Santa Monica, California, into a prominent Hollywood family; her father was writer and producer Dominick Dunne.
  • Considered a talented young performer whose career was just taking off when she was killed.

What happened to her?

  • On October 30, 1982, her ex-boyfriend, chef John Thomas Sweeney, came to her home while she was running lines with fellow actor David Packer.
  • They argued outside the house about their relationship; the argument escalated and Sweeney strangled her in the driveway/bushes until she lost consciousness.
  • A witness (Packer) found Sweeney kneeling over her and later testified to hearing the altercation and discovering her unconscious.
  • Responding officers found her unconscious; she was placed on life support in the hospital and died on November 4, 1982.

Before the killing: abuse and breakup

  • Dunne and Sweeney had a volatile relationship marked by physical abuse, including an incident where he pulled out clumps of her hair and terrified her enough that she fled to her mother’s house.
  • She broke up with him and tried to distance herself, but he continued contacting her and seeking reconciliation.
  • On the night of the attack, he came over insisting on talking about getting back together; he later claimed he “exploded” when she rejected him.

The trial and sentence

  • Sweeney was arrested at the scene; multiple reports say he told police, “I killed my girlfriend, and I tried to kill myself.”
  • He was ultimately charged not with murder but convicted of voluntary manslaughter in 1983, a decision that shocked the public and her family.
  • He received a sentence of 6–7.5 years (often reported as 7.5), but served only about 2.5 to 3 years before being released on parole.
  • The perceived leniency helped fuel broader conversations in the 1980s and after about how the justice system handles domestic violence and intimate partner homicide.

Legacy, media, and “latest news”

  • Her father, Dominick Dunne, attended every day of the trial and later wrote and spoke extensively about the case, becoming a prominent commentator on high-profile trials (including the Menendez brothers case).
  • The case is often referenced in discussions of the so‑called Poltergeist “curse” because multiple cast members died young, though there is no evidence of anything supernatural—only tragic, real-world violence.
  • In recent years, her story has resurfaced in true-crime podcasts, YouTube documentaries, and TV specials, including deep dives by outlets like TMZ Studios and various true-crime creators.
  • Newer articles and videos (2024–2025) revisit what happened to Dominique Dunne, connect it to broader domestic violence awareness, and examine the impact on her family and on media coverage of celebrity crime.

TL;DR: Dominique Dunne, the 22-year-old Poltergeist actress, was killed in 1982 after her abusive ex-boyfriend strangled her outside her home; he was convicted only of voluntary manslaughter, served a few years, and her case remains a widely discussed example of intimate partner violence and controversial sentencing in Hollywood history.

Information gathered from public forums or data available on the internet and portrayed here.