Residents of the Long Island community where accused Gilgo Beach serial killer Rex Heuermann lived are sharing details of their interactions with him and his family.

Heuermann faces charges of first- and second-degree murder in connection with the deaths of Melissa Barthelemy, Megan Waterman and Amber Costello, whose bodies were found buried on Long Island’s Gilgo Beach in 2010.

He is also the prime suspect in the death of a fourth woman, and investigators are exploring whether he might be tied to other unsolved killings and missing persons.

Massapequa Park barber Jack Lak said Heuermann for decades came in for a haircut every three to four months and would usually keep to himself.

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

Lak added that he couldn’t believe Heuermann was the man accused of the murders. “It was shocking,” Lak told the Post. “He seems like a regular person. You’d never think anything like that.”

Others found Heuermann strange, such as the deli counter worker who said Heuermann was a returning customer.

“I served him for 20 years,” the woman, who asked not to be identified, told the Post. “[He was] the same as always: weird.”

Neighbor Etienne Devilliers said she sometimes saw Heuermann in the mornings. He would regularly walk from his home to the train station to commute into Manhattan, where he ran an architectural firm.

“He keeps to himself, we’d say hello to each other once in a while, and that was it. Morning pleasantries,” Devilliers told NBC New York.

One account of Heuermann at the office suggested that he was not one to express his feelings. Niv Miyasota, who worked for Heuermann for years, said the accused serial killer appeared to lack empathy.

“He was socially awkward in many ways,” Miyasota told the Daily Mail. “I guess the word for it is, he just didn’t seem to have empathy.

“He was sort of like a cipher, like, what is this person? I didn’t get angry, kind or sad from him. I just got blank. I didn’t get his deal.”

Meanwhile, Heuermann’s wife, Asa Ellerup, and their children were often seen shopping at a local grocery store, where they tended to visit multiple times per week and paid with food stamps, according to The New York Times. Heuermann was not known to accompany them.

Store manager Mery Salmeri said Ellerup often appeared depressed.

“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,” Salmeri told the Times.

Ellerup filed to divorce Heuermann this week, according to Fox News.

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[Feature Photo: Rex Heuermann/Suffolk County Sheriff’s Office via AP]