New details emerge about accused Gilgo Beach serial killer Rex Heuermann’s seemingly mundane life

Accused Gilgo Beach serial killer Rex Heuermann blended into his Long Island neighborhood with a quiet humdrum personality that some found a little “weird,” locals told The Post on Friday.

Workers at shops and restaurants frequented by the hulking 59-year-old married dad of two said he led a seemingly mundane life, was usually seen around Massapequa Park alone and sometimes came off as polite but strange.

“I served him for 20 years,” said a former deli counter worker who asked not to be named.

“[He was] the same as always — weird,” she said, declining to comment further.

Jack Lak, who cuts hair at a barber shop on Park Boulevard, said Heuermann, a Manhattan architect, came in for a trim every three or four months for decades.

He kept to himself, sat in the same chair every time and was a decent tipper, said Lak, 40.

“He’d just sit quietly and wait for his turn. He never talked to anybody,” Lak said. “He paid $10 or $15.  He was an average tipper. He always paid in cash. He would say thank you after he paid.”

The accused killer came off like a normal guy, said Lak, adding he was stunned to learn Heuermann had been charged last week with the murders of three women.

“It was shocking,” he said. “He seems like a regular person. You’d never think anything like that.”

Six months ago, Heuermann tried to sell CDs to Infinity Records on Park Boulevard and left politely when he was turned down, said a worker who only have the name Corey.

“I never saw him with anyone. He was always alone,” said the 33-year-old employee, adding he also saw Heuermann around town from time to time.

Employees at the IGA supermarket where Heuermann’s wife and kids shopped said the accused murderer never came in with them, according to the New York Times.

Cashiers at the grocery store knew them as a joyless family that shopped several times a week and paid with food stamps, the paper reported.

Heuermann’s wife, Asa Ellerup, 59, often looked depressed, said store manager Mery Salmeri.

“Maybe his family was just so scared of him that they were like his prisoners who would never tell anyone, even if they had some idea of what he was capable of,” she told the paper.

Ellerup filed for divorce from Heuermann on Wednesday, less than a week after he was charged with murdering Melissa Barthelemy, Megan Waterman and Amber Lynn Costello. Heuermann remains the “prime suspect” of a fourth woman, Maureen Brainard-Barnes, also, authorities have said.