The Gilgo Beach Killer and Rex Heuermann: A Cold Case Cracked, A Mystery Still Open

For thirteen years the stretch of Ocean Parkway between Gilgo Beach and Oak Beach on the south shore of Long Island held one of the most disturbing unsolved serial-murder investigations in American history. Police kept finding bodies and could not find the man putting them there. Then on July 13, 2023, an unremarkable Manhattan architect was led out of his Massapequa Park colonial in handcuffs, and a case that had defied two governors, three district attorneys, and an entire generation of true-crime podcasters finally had a defendant.

That defendant is Rex Heuermann. He has pleaded not guilty. The Suffolk County District Attorney has so far charged him with seven of the murders. The case is still unfolding in court, and several of the older killings recovered along the same parkway have not been tied to him at all. The Gilgo Beach story is no longer entirely cold, but it is also not yet finished.

The 911 call that started everything

The case officially begins not with a body but with a phone call. At about 4:51 a.m. on May 1, 2010, a 24-year-old sex worker from New Jersey named Shannan Gilbert dialed 911 from inside an Oak Beach Association cottage where she had gone to meet a client. She told the dispatcher, repeatedly, that someone was trying to kill her. The call lasted twenty-three minutes. Police responded slowly. By the time they arrived, Gilbert had run out the door and into the surrounding marshland and disappeared.

Suffolk County Police searched, with what later reviews described as glaring inadequacy, for several months. Then on December 11, 2010, a K-9 officer training a cadaver dog along Ocean Parkway about 6 miles from where Gilbert vanished found something. It was not Shannan Gilbert. It was the wrapped body of a young woman named Melissa Barthelemy.

Within two days, three more bodies appeared in the same stretch of brush. Within four months, the count along Ocean Parkway had reached ten sets of human remains, plus a partial recovery linked to an earlier Manorville case. Shannan Gilbert's own remains were finally found in a marsh in December 2011. Suffolk County officially classified her death as accidental drowning, a ruling her family has rejected for more than a decade.

The Gilgo Four

The first four victims discovered in December 2010 were quickly grouped together. They became known as the Gilgo Four:

• Melissa Barthelemy, 24, missing since July 2009
• Maureen Brainard-Barnes, 25, missing since June 2007
• Megan Waterman, 22, missing since June 2010
• Amber Costello, 27, missing since September 2010

All four were sex workers who advertised on Craigslist or its successor sites. All four had vanished after meeting a client. All four were found wrapped in burlap, their bodies arranged within a quarter-mile of each other on the north side of Ocean Parkway. The pattern, the staging, and the burlap convinced investigators almost immediately that they were dealing with a single killer.

The other remains found along the parkway, including a toddler, a young Asian man dressed in women's clothing, and a still-unidentified woman known for years as Jane Doe Number Six (later identified in 2022 as Valerie Mack), would prove harder to fit into a single profile. Some may belong to the same offender. Others, investigators have suggested, may be victims of separate cases that happened to use the same body-dumping ground.

The decade of nothing

By any objective measure, the original Suffolk County investigation was a disaster. The lead detective, James Burke, was himself convicted in 2016 of beating a man who had stolen items from his SUV and pressuring others to lie about it. The Suffolk County District Attorney during the same period, Thomas Spota, was later convicted on federal corruption charges related to the cover-up of Burke's beating. The agency that should have been hunting a serial killer was instead policing itself badly.

Tips piled up. So did theories. A Hampton Bays doctor named Peter Hackett, who lived near the Oak Beach Association cottage where Shannan Gilbert had vanished, was investigated and cleared, though the Gilbert family kept filing civil claims. Profilers debated whether the killer was a single person, multiple people, or a network. The case became fodder for documentaries, including Netflix's Lost Girls in 2020 based on Robert Kolker's careful book.

Through all of it, the killer simply stopped. The bodies along Ocean Parkway dated to between 1996 and 2010. After 2010, the killings appeared to halt. That fact alone, in retrospect, told investigators something important: their suspect was a working professional with stable employment, a family, and access to resources. He had not gone to prison. He had not died. He had simply gone quiet because he understood, after the December 2010 discovery, that he had been seen.

The 2022 task force

In February 2022, a new Suffolk County District Attorney, Raymond Tierney, announced an inter-agency task force that combined Suffolk County Police, New York State Police, the FBI, and the Suffolk County District Attorney's office. The team began re-examining the Gilgo Four files from the beginning, this time with modern cellular forensics, social-media archives, and DNA technology that had not existed in 2010.

The breakthroughs came in stages.

A green pickup truck, a Chevrolet Avalanche, had been described by Amber Costello's roommate as the vehicle of the man who had picked her up on the night she disappeared in 2010. Suffolk records of registered green Avalanches in the relevant period produced a manageable list of names. One of them was Rex Heuermann.

Cellphone billing records covering the same window showed that a number registered to Heuermann had been in repeated contact with at least three of the Gilgo Four shortly before they disappeared. Burner-phone activity tied to taunting calls made to the Barthelemy family in 2009 was traced to towers consistent with Heuermann's commute between his Manhattan office and his Massapequa Park home.

In June 2023, investigators surveilling Heuermann recovered a discarded pizza crust outside his Manhattan office building. DNA from the crust matched a hair recovered from the burlap binding of one of the Gilgo Four victims. Within weeks, additional hair and fiber matches connected him to two other victims. On July 13, 2023, he was arrested as he left his Manhattan office on Fifth Avenue.

Who Rex Heuermann is

Heuermann is in many ways the suspect the public did not want. He is not a drifter. He is not a stranger. He is a 60-year-old licensed architectural consultant who ran his own Manhattan firm, RH Consultants & Associates, with a corporate website and references from major commercial clients. He was born in Massapequa Park and has lived in the same modest two-story colonial on First Avenue for almost his entire life. He was married, with two children, and had been a fixture in his neighborhood for decades.

Searches of his property since the arrest have recovered, according to court filings, a stockpile of firearms, hard drives containing material relevant to the investigation, and what prosecutors describe as a planning document on which Heuermann had recorded notes about specific victims. The same searches have steadily produced enough evidence for additional indictments. As of early 2026 he has been charged in seven of the eleven Ocean Parkway cases, including the original Gilgo Four, Maureen Brainard-Barnes (later upgraded), Sandra Costilla (a 1993 victim recovered in North Sea, NY), and Jessica Taylor.

He has pleaded not guilty to all charges and remains in custody pending trial.

What is still unsolved

The arrest of Rex Heuermann does not close the Long Island serial killer file. Several questions are still genuinely open.

The unconnected remains

At least two of the eleven sets of remains found along Ocean Parkway have not been tied to Heuermann. Investigators have publicly said they continue to consider whether some of the older or anomalous victims belong to a different offender. The toddler, identified in 2011 as the daughter of one of the victims, complicates any single-killer theory. The young man known for years as John Doe, identified in 2020 as a 17-to-23-year-old of Asian descent, does not match the Gilgo Four pattern.

Shannan Gilbert

The Suffolk County medical examiner's ruling that Shannan Gilbert drowned accidentally has never satisfied her family, her friends, or many independent observers. The 911 transcript depicts a woman in obvious terror. Her route through the Oak Beach marsh on the night she disappeared remains poorly explained. Heuermann has not been charged in connection with her death, and the Gilbert family continues to push for a homicide reclassification.

The pre-2007 timeline

If Heuermann is convicted of the 1993 Costilla murder, the active phase of his offending stretches back nearly two decades before the December 2010 discoveries. That window, between roughly 1993 and 2007, is sparsely documented. Investigators have hinted publicly at unsolved disappearances of women in the New York metro area during those years that may yet be linked to him.

A case still becoming history

For most of the past fifteen years, the Long Island serial killer was a name without a face. Now there is a face, a Massapequa Park colonial, a Manhattan office, and a defendant whose neighbors say they had no idea. The trial, when it finally arrives, will turn private suspicions into public record, and will probably produce more victims still to be identified.

It will not, however, answer everything. Some of the Ocean Parkway dead may belong to a different story. Shannan Gilbert's last twenty-three minutes are still mostly her own. And the question of how a man can drive a green pickup truck up and down a single stretch of parkway for two decades without being caught will haunt American policing long after Rex Heuermann's case has been decided one way or the other.