More than 4 years after the bodies of at least 8 sex workers were found on Long Island’s Gilgo Beach, a former escort and current stylist says she had dinner with accused killer Rex Heuermann, and she says she knew he was the serial killer.

TMZ interviewed Nikki Brass for Sunday’s Fox documentary, “TMZ Investigates: Gilgo Beach Serial Murders: Missed Warning Signs,” and she describes in great detail how she spent an evening with Heuermann at a Long Island restaurant, 45 miles from where the bodies were buried.

She says during their dinner in 2015, he asked if she was a fan of true crime, which she was. He then asked if she was familiar with the Gilgo Beach murders, and she said of course she was.

Then things turned … according to Nikki, Heuermann was not so much talking about the murders as he was bragging about them. She was so creeped out, she called a friend to pick her up.

When dinner was over, Heuermann asked her to come home with him, and she declined. Nikki says he got angry and she left.

Nikki, who is now a stylist, says the way he spoke about the murders, she was convinced Heuermann was the Gilgo Beach serial killer and told many of her friends for years.

She didn’t go to cops because she was on probation for a drug offense.