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The trial of the boyfriend of actress Dominique Dunne — one of many stars of “Poltergeist” — stands out as one of the crucial appalling miscarriages of justice … and what unfolded within the aftermath of the 1982 homicide is particularly unsettling — all uncovered in our new FOX primetime particular … which finds stunning new proof.

Within the harrowing doc airing Monday night time, we verify Griffin Dunne‘s lingering suspicion his sister’s killer, John Sweeney, had dedicated extra home violence after the trial — one specific case from 2000 … when a girl filed a restraining order in opposition to him, alleging stunning brutality.

Too scared to talk on digicam, the lady speaks on to Harvey Levin … recalling how he dragged her by her ponytail by way of a resort foyer, shoved her head in a tub, pushed her in opposition to a wall, and put his fingers on her collarbone close to her throat.

She escaped with their toddler little one and hasn’t seen him since … and regardless of getting the police concerned, Sweeney wasn’t charged with a criminal offense.

Charles Wessler, an Oscar-winning producer and household good friend of the Dunnes, says the latest revelations do not come as a shock … claiming Sweeney nonetheless caries the identical risky rage to this very day. Dominque’s devastated pal Gloria echoes the sentiment, saying he was by no means cured … calling him a caged animal.

Harold Johnson, the lead detective within the 1982 case, is equally disturbed … saying it is a travesty a person as violent as Sweeney remains to be going round choking girls.