Brian Dennehy was one of the great American character actors.

Rugged and exuding a sense of weariness, as if he were someone who had seen it all, Brian Dennehy cut a uniquely American figure. He was one of those actors who could play a New York fireman as easily as he could play a Tennessee farmer. He had those eyes that said, “Don’t mess with me,” but also the manner that made you feel everyone was welcome in his house as long as they didn’t think they were better than anyone else. He was one of those actors who could be both likable and intimidating. He was perfectly cast as Sheriff Teasle in First Blood because, even if he was a bit too hard on John Rambo when he first picked him up, it was still easy to see that Teasle didn’t mean to be a jerk. He was just doing his job. He thought he was keeping his town safe. Dennehy was just as credible playing a benevolent alien in Cocoon, a western outlaw in Silverado, or a burned-out cop in F/X. When Dennehy played a hero, you felt safe whenever he was onscreen. When he played a bad guy, he was absolutely terrifying.

Dennehy played one of the worst of the real-life bad guys in the 1992 television film To Catch a Killer. He plays John Wayne Gacy, a contractor considered a pillar of his community in the suburbs of Chicago. He runs a successful business. He hires young men who really need the money. He has a big smile. He’s involved in local politics and even has a framed picture of himself with President Jimmy Carter’s wife. In his spare time, he dresses up like a clown and entertains the children at the local hospital. He uses the name Pogo and paints sharp points at the corners of his mouth, giving him a somewhat sinister appearance. Everyone seems to like him. Of course, most people don’t know that Gacy is an ex-con who did time for sexually assaulting a 15-year-old boy in Iowa. This film takes place in the late ’70s, before anyone could just hop online and look up public records.

To Catch a Killer follows Detective Joe Kozenczak (Michael Riley) as he investigates the disappearance of a young man last seen being offered a job by Gacy. Joe suspects Gacy from the start, but he’s continually told that Gacy is a pillar of the community. What makes this film so effective is that Brian Dennehy plays Gacy as someone so arrogant he barely bothers to hide his guilt, but also as someone with such a victim complex that he won’t stop whining about being suspected of doing something he definitely did. The scene where Gacy demonstrates a handcuff trick is frightening because Gacy seems so desperate for companionship, and so goofy, even while he’s preparing to murder someone. Personally, I prefer it when Dennehy is playing a good guy (or, at the very least, a misguided bad guy like in First Blood), but that doesn’t change the fact that he was frighteningly believable as John Wayne Gacy. Dennehy was Emmy-nominated for his performance here.

As for the real John Wayne Gacy, he killed at least 33 people before he was apprehended in 1978. (It’s thought that the actual number is much higher.) He was executed in 1994, two years after this film aired. Reportedly, his last words were, “Kiss my ass.”