Rex Heuermann fits the classic profile of a serial killer living a double life, according to a former FBI profiler — who said he “wouldn’t be surprised” if the family man has murdered more than the “Gilgo Four.”

“Serial offenders lead parallel lives,” former agent Brad Garrett told ABC’s “Good Morning America” Monday when asked about the 59-year-old married dad of two.

“They can do horrendous things, kill people, torture people … then they can go home, they can feed their kids, they can kiss their wife goodbye … and their life goes on,” he said.

“That’s why the term ‘hide in plain sight’ is very relevant to serial offenders,” Garrett said.

The mass of alleged evidence already shared means that the ex-FBI profiler “wouldn’t be surprised” if the architect has killed others, he said.

After bodies were found at Gilgo Beach in December 2010, the serial killer “may have changed locations where he placed the deceased.”

Suffolk County’s police commissioner, Rodney Harrison, shared similar conclusions about Heuermann living “two types of lives” in the ramshackle Massapequa Park home he’s always lived in.

Heuermann had “a very, very bizarre lifestyle,” Harrison told News 12 Long Island.

“He was a family man, architect — but when his wife would go out of town, some of the things that he participated in was very, very dangerous for our community,” said the commissioner.

“It’s a very good thing that we got this animal off the streets,” he told CNN.

The Gilgo Beach task force “will stay intact” to continue investigating the murders of six other people found not far from the four women Heuermann has been accused of murdering, Harrison said.

“Is Rex Heuermann part of those six? Well, we’ll wait and see,” he told the local station — saying that “time will tell” if he acted alone.

“But everybody needs to understand that the task force will stay intact — we’re going to continue to work and see what we can do to bring closure to the other families that unfortunately are suffering.”

The suspect’s DNA is also being used to see if there are matches to other cold cases, and the FBI has been involved in investigations far from New York.

Heuermann owned land in an isolated, wooded area near his brother’s house in South Carolina — and officials suggest he may have kept the Chevrolet Avalanche that first tied him to the serial slayings.

Who is Gilgo Beach serial killer suspect Rex Heuermann?

A suspected serial killer has been arrested over the notorious Gilgo Beach murders in Long Island, The Post can confirm.

Rex Heuermann, 59, a married dad of two and architect at a New York City firm, has a home on 1st Avenue in Massapequa Park, sources told The Post.

6

His arrest is tied to the “Gilgo Four,” four women — Melissa Barthelemy, 24, Megan Waterman, 22, Amber Lynn Costello, 27, and Maureen Brainard-Barnes, 25 — found wrapped in burlap within days of each other in 2010. 

The body of Barthelemy was first found along Ocean Parkway on Dec. 11, 2010, sparking fears of a serial killer in the area.

• Burner phones, Google searches and pizza crust: How cops busted ‘ogre’-like Gilgo Beach suspect Rex Heuermann
• Everything we know about family of ‘quiet’ Gilgo Beach serial killer suspect Rex Heuermann
• Long Island woman, 25, reveals recent disturbing encounter with Gilgo Beach serial killings suspect Rex Heuermann

By spring 2011, the number of bodies had climbed to 10, including eight women as well as an unidentified man and toddler.

Heuermann’s arrest comes after Suffolk County’s new police commissioner created a special Gilgo Beach Homicide Investigation Task Force in February 2022.

Heuermann has pleaded not guilty to murdering Melissa Barthelemy, Megan Waterman and Amber Costello.

He has been named the prime suspect in the murder of Maureen Brainard-Barnes, and Suffolk County District Attorney Ray Tierney said Monday that he is “confident” he’ll be charged with it.

His attorney, Michael Brown, insisted Monday that “there is nothing about Mr. Heuermann that would suggest that he is involved in these incidents.”

Brown claimed that “the government has decided to focus on him despite more significant and stronger leads,” without elaborating on what they were.

“We are looking forward to defending him in a court of law before a fair and impartial jury of his peers,” Brown said.