A man who lived next door to Long Island serial killer suspect Rex Heuermann says he “always thought this guy was a weirdo” as he details odd behavior over the years.

One night years ago, Dominick Cancellieri told NewsNation, he heard digging from Heuermann’s backyard in the Long Island village of Massapequa Park.

“I really wanted to go and check out what it was and look through the fence, but something stopped myself from doing it,” Cancellieri said. “Now, with everything coming to fruition, it doesn’t surprise me in the slightest bit.”

Heuermann is charged in the deaths of three of the “Gilgo 4,” four women found dead and buried, wrapped in burlap sacks, on Gilgo Beach more than a decade ago, as CrimeOnline has reported. Police said he is the prime suspect in the death of the fourth.

Police have been at his Massapequa Park home since his arrest last week, carrying multiple items out and carefully checking everything — including a locked room found in the basement.

Cancellieri said Heuermann also burned garbage at his house.

“It seemed to be like once every few weeks, I would smell garbage burning at his house,” Cancellieri said.

It’s not clear if burning garbage is allowed in Massapequa Park. According to the New York Post, burning garbage is illegal in Nassau County, where Heuermann lives.

Cancellieri also described an argument he had with the 59-year-old architect over parking. Heuermann, he said, parked his truck halfway into his space.

“I said to him, ‘Listen, you’ve got to move your car,’ and he got a little loud, I got a little loud back with him, and he ended up finally moving his car, but every instance, even just the way he looked, I always thought this guy was a weirdo,” Cancellieri said.

Heuermann has pleaded not guilty to six charges in the deaths of Melissa Barthelemy, Megan Waterman, and Amber Costello.

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[Featured image: Rex Heuermann/Suffolk County Sheriff’s Office via AP]