Rex Heuermann’s now-estranged wife quickly came to terms with the fact he was being accused of being a perverted serial killer, according to the top cop in the case — who said she told officers, “OK, it is what it is.”

Asa Ellerup, 59, was home in Massapequa Park last Thursday when officers burst in at the exact moment her husband was busted outside his Midtown Manhattan architectural firm, Suffolk County Police Commissioner Rodney Harrison told Fox 5 on Wednesday.

“When we told the wife, she was shocked, she was embarrassed,” Harrison said.

“But there was a point where we showed her certain pictures and she said, ‘OK, it is what it is.'”

The commissioner did not reveal exactly what images helped Heuermann’s wife of at least 25 years accept that he may be behind the notorious killings.

However, her husband was seen in numerous images in court documents buying apparent burner phones and posing for creepy selfies while allegedly hooking up with sex workers.

DNA from Ellerup’s own hair has been pivotal in the Gilgo Beach case, but officials say she was traveling each time the four women her husband has been accused of killing had disappeared.

Harrison previously told CNN that the reaction of Ellerup and her two kids suggested they had no idea “about this double life” as an alleged killer.

“But, time will tell,” he told the network. “And once again, there are still a lot more questions that need to be done to the family and friends.”

Heuermann has yet to have a single visitor at the Suffolk County correctional facility where he’s being held since his arraignment Friday, Sheriff Errol Toulon Jr. told CNN.

And on Wednesday, Ellerup filed for divorce, just six days after the shock of her husband’s arrest.

She and her adult kids have had their worlds “turned upside down,” her newly retained attorney, Bob Macedonio, told the US Sun.

Who were the Gilgo Beach victims?

Suspected serial killer Rex Heuermann — a New York City architect and married dad of two — was arrested in connection with the long-unsolved Gilgo Beach murders. The arrest is tied to the so-called “Gilgo Four,” women found wrapped in burlap within days of each other in late 2010.

The years-long investigation that led to the arrest revolved around the discovery of more than 10 sets of human remains along Ocean Parkway near Gilgo Beach in Suffolk County between December 2010 and April 2011.

Most victims were petite female sex workers with green or hazel eyes. But there were also two exceptions: a 2-year-old girl and a young Asian man.

Melissa Barthelemy, 24

• Barthelemy was a sex worker who lived in the Unionport section of the Bronx and dreamed of one day opening her own beauty salon. She was last seen alive in her basement apartment on Underhill Avenue on July 12, 2009. Heuermann was charged for Barthelemy’s murder in July 2023.

Maureen Brainard-Barnes, 25

• Brainard-Barnes was living in Norwich, Connecticut. She went missing after taking an Amtrak train from New London, Connecticut, to Grand Central Terminal in Manhattan on July 6, 2007. Her remains were found in December 2010. Heuermann was charged for Brainard-Barnes’ murder in January 2024.

Amber Lynn Costello, 27

• Costello, 27, was a sex worker and heroin addict who lived in West Babylon, New York, at a home with a woman and two men. She advertised on Craigslist and Backpage to support her and her roommates’ drug habits. Costello was found on December 13, 2010, after having been last seen leaving her home September 2, 2010. Heuermann was charged for Costello’s murder in July 2023.

Megan Waterman, 22

• Waterman, a 22-year-old mom of one, was last seen on June 6, 2010. She lived in Scarborough, Maine, and earned a living as an escort. She was last seen by her family boarding a New York-bound Concord Trailways bus in Maine. Her body was found on December 13, 2010, on the north side of Ocean Parkway, near Gilgo Beach. Heuermann was charged for Waterman’s murder in July 2023.

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Jessica Taylor, 20

• Remains belonging to Jessica Taylor, a 20-year-old woman working as an escort in New York City, were found in a wooded area in Manorville on July 26, 2003. Her additional remains — initially labeled “Jane Doe No. 5” — were discovered on March 29, 2011, along Ocean Parkway.

Valerie Mack, 24

• Valerie Mack was 24 years old and living in Philadelphia when she went missing. She worked as an escort, using the alias “Melissa Taylor.” Relatives last saw Mack in the spring or summer of 2000 in Port Republic, New Jersey, but she was never reported as missing to the police. Her partial skeletal remains were found in Manorville in September 2000 but were initially known as “Jane Doe No. 6.” More bones were found on April 4, 2011, along Ocean Parkway.

Unidentified Asian man

• The skeletal remains of a yet-to-be-identified Asian man were found along Ocean Parkway on April 4, 2011. It is estimated that the man was between 17 and 23 years old at the time of his death. He was approximately 5 feet 6 inches tall with bad teeth.

‘Peaches’ and her daughter

• An African American woman’s partial remains were discovered in Hempstead Lake State Park back in 1997, and she had become known as “Peaches” because of a bitten tattoo of a peach on her left breast. On April 4, 2011, police uncovered the remains of a toddler, who was about 2 years old at the time of her death. DNA testing confirmed that one of the skeletons was that of the 2-year-old girl’s mother, “Peaches.”

Karen Vergata

• A victim previously referred to as Jane Doe No. 7 has been identified as 34-year-old Manhattan woman Karen Vergata. Vergata is believed to have disappeared around Feb. 14, 1996; two months later, her legs were found in a plastic bag at a park near Fire Island’s Blue Point Beach. At the time of her disappearance, Vergata was believed to have been working as an escort. Two sets of Vergata’s remains were identified in August 2023.

Shannan Gilbert, 23

• Gilbert was a Craigslist escort who lived in Jersey City, traveled with her driver Michael Pak from Manhattan to meet a client, Joseph Brewer, at his home in the Oak Beach Association on the morning of May 1, 2010. She spoke with two neighbors before disappearing. Her body was discovered in a marsh near Oak Beach — about half a mile from where she was last seen alive — on December 13, 2011.

Jessica Taylor, 20

• Taylor, a 20-year-old woman working as an escort in New York City, were found in a wooded area in Manorville on July 26, 2003. Her additional remains — initially labeled “Jane Doe No. 5” — were discovered on March 29, 2011, along Ocean Parkway.

Sandra Costilla

• Costilla was murdered in 1993 but had not been included among the so-called Gilgo Beach victims — until now. Investigators suspected convicted serial killer John Bittrolff in Costilla’s death, but he was never charged in her slaying — which remains one of several unsolved Long Island murders.

“Obviously this has been a shocking time for them and a pretty difficult time to comprehend,” he said.

“As with any family, it’s extremely upsetting and they’re totally shocked and caught off guard.

“The family doesn’t want to make any further comment than that.”

Ellerup was pictured for the first time since the arrest with 26-year-old daughter Victoria — who worked for her dad’s architecture firm. It was not immediately clear if the man with them was her son, who neighbors say has special needs.

In his Fox 5 interview, Harrison said the breakthrough match to Heuermann’s distinctive Chevy Avalanche was thanks to a state police database — suggesting that info was not available in the 12 years before he set up the special Gilgo Beach task force.

He also let on that the fear of Heuermann’s arsenal of up to 300 guns was not the only reason he was nabbed in Midtown and not at home.

“The strategy was to see if we could catch him by his workplace, take that long ride from 35th and Fifth out to 30 Yaphank — which could be a one-and-a-half-hour ride — and see if he could talk and give up anything,” Harrison continued.

Instead, “He asked for a lawyer — and that was the end of the conversation,” Harrison said.

Heuermann was charged with three counts of murder in the deaths of Amber Lynn Costello, 27, Melissa Barthelemy, 24, and Megan Waterman, 22. He pleaded not guilty on Friday. He has also been named the “prime suspect” in the death of Maureen Brainard-Barnes, 25.