She made her on-screen debut with the television film diary of a teenage hitchhiker (1979) and played recurring roles. Dominique ellen dunne was an american actress. Heres everything to know about the death of the young actress and where her killer is now. She died five days later at 22 years old. This diagnosis highlighted the violent nature of the assault, marking her death as a tragic example of domestic violence. Who was dominique dunne? · when she refused, sweeney grabbed dunne ’s neck, choked her until she was unconscious, and left her to die in her hollywood home’s driveway. He only served six years in prison and became a chef at a fancy restaurant. On , dunne was strangled by her ex-boyfriend john sweeney during an argument on the driveway of her west hollywood home. · dominique dunne, the star of poltergeist, was strangled by john thomas sweeney after breaking up with him. 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). · so what happened to dominique dunne ? · dominique, who starred in poltergeist and the shadow riders, was strangled to death by her ex-boyfriend, john sweeney, on. · the official cause of death was cerebral anoxia due to manual strangulation. How did dominique dunne die? She fell into a coma and died five days later on at the age of 22. Who was dominique dunne on poltergeist? Afterwards, she headlined the western film the shadow riders and guest starred in one episode of the crime series chips (both 1982). Her breakthrough role was dana freeling in the blockbuster horror film poltergeist (1982). Who were dominique dunne and james canning? Who killed dominique ellen dunne & john thomas sweeney? Who killed dominique dunne?