"Rex Heuermann is everything we've been led to believe would be the guy," said reporter Josh Einiger. "He's kind of a loner. He's kind of antisocial. His house is different from every other house on that block. It's sort of a mess. He works in the city. He has a job, where he's very technical, where he's an architect and engineer."

The amazing details of the investigation that finally collared a suspect in the longtime cold case.

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On July 13, 2023, police finally made an arrest in the Gilgo Beach murder case.

"This was an earthquake in Massapequa Park. This was a storm like they had never expected this," recalled Eyewitness News reporter Stacey Sager.

Rex Heuermann was arrested in Midtown Manhattan. He was initially charged in the deaths of Megan Waterman, Amber Lynn Costello, and Melissa Barthelemy.

Investigators also named him as the prime suspect in the death of Maureen Brainard-Barnes.

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Eyewitness News got an alert that Suffolk County police were going to release surveillance video of Megan Waterman leaving a hotel in Hauppauge -- the last place she was seen.

"As reporters were thinking, again, why do this now?" recalled Kristin Thorne. "They've had this video for so many years -- why now? And they said they want to keep the case going."

Then on May 9, 2022, Suffolk County Police released a 22-minute 911 phone call from Shannan Gilbert the night she disappeared in 2010.

"The 911 tape was sort of as advertised," said Einiger. "It was Shannan Gilbert sounding terrified running for her life."

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In December 2015, the FBI joined the investigation.

Why did that collaboration not happen for so many years?

"It didn't happen because of politics. We had a police chief in Suffolk County, as well as a DA, that did not seem open to FBI involvement," recalled Kristin Thorne.

On Jan. 16, 2020, police released photos of a belt imprinted with the letters "H-M" or "M-H" to the public. Police say they believe the belt was handled by the suspect.

Two years later, Suffolk County Police Commissioner Rodney Harrison announced a new task force to investigate the Gilgo Beach murders.

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After a year and a half of searching, investigators found the skeletal remains of Shannan Gilbert on Gilgo Beach.

"What was the ultimate stunner in all of this is that they believed -- and still do believe -- that Shannan Gilbert was not murdered. That Shannan Gilbert died in an accidental drowning," recalled reporter Josh Einiger.

A few years later, Shannan Gilbert's mother, Mari Gilbert, who is credited for the discovery of the Gilgo bodies because of how she pushed for her daughter's search, is found stabbed to death in her apartment.

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Investigators had found 10 bodies and identified five of them, but they were still searching for Shannan Gilbert.

"This investigation started because Shannan Gilbert disappeared," said reporter Kristin Thorne. "It wasn't until Shannan Gilbert disappeared that her family started to hold police accountable and say -- you have to get out there and try to find Shannan Gilbert."

Investigators found a cell phone, lip gloss, shoes, and a pocketbook they say belonged to Shannan Gilbert on Gilgo Beach.

Yet they did not believe her death was related to the 10 bodies they found in the area.

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Investigators continued to find more bodies, but the remains differed from those of the "Gilgo Four".

Police found three more victims in the area between Oak Beach and Gilgo Beach, bringing the total count of victims to eight.

Investigators identified the victims as Jane Doe Number 6, a baby girl and an Asian man.

Investigators then say they believe they are looking for three, if not four, killers.

"This is around the time that it got complicated to tell this story," reporter Josh Einiger recalled.

We shed light on this complex stage of the story.

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Shannan Gilbert's disappearance in 2010 sparked the discovery of 11 bodies on and near Gilgo Beach on Long Island.

"One of the most significant things I've ever heard at any kind of public official say, I think it was the first full day after that first report that we did," recalled Einiger. "There was a press conference with the man who was then the police commissioner. And he said something that to this day, I remember everything about what he said and how he said it."

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It began on a regular garden variety day in December, when Eyewitness News reporter Josh Einiger and his photographer, Tony Saturno, were covering stories in Suffolk County.

"We were on our way back and we got a call from the desk - saying 'there's a crime scene, there's a maybe body discovered', way down south on Ocean Parkway. Go check it out," Einiger said.

When they arrived at the scene, it was cold and pitch black. There were four crime scenes along the beach and spotlights set up.

"It was clear at that point that it was something," recalled Einiger.

Nobody quite understood it was something that we'd be talking about over a decade later.

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Few situations exist in which one can draw a parallel to the men and women who lost their lives on 9/11.

But, retired NYPD detective Michael Prate said one does stick out in his mind - the murder of Henryk Siwiak in Brooklyn during the last few minutes of that tragic day.

Siwiak, 46, a recent Polish immigrant, was supposed to be at his first night at a new job at a grocery store in Brooklyn.

He got on the A train and that's where he made a fatal error.

If you know anything about the murder of Henryk Siwiak, call NYPD Crime Stoppers at 1-800-577-TIPS.

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