The Long Island Serial Killer: The Gilgo Beach Murders.

The Gilgo Beach discoveries, in a paragraph.

On the morning of December 11, 2010, a Suffolk County Police K-9 officer and his cadaver dog Blue, searching the thick brush along Ocean Parkway near Gilgo Beach for any sign of the missing 24-year-old escort Shannan Gilbert, came upon a set of skeletal human remains in a burlap sack. Within four days, the same team had found three more sets of remains within a quarter-mile of the first — arranged at roughly equal intervals along the shoulder of the highway. Through dental and DNA records all four were identified within weeks as young women who had advertised on Craigslist or Backpage for sex work: Melissa Barthelemy of Buffalo, Megan Waterman of Scarborough, Maureen Brainard-Barnes of Norwich, and Amber Lynn Costello of North Babylon. They had disappeared between 2007 and 2010. They became known as "the Gilgo Four." Over the following four months, in further searches that extended west along Ocean Parkway and east into the Cedar Beach and Jones Beach Island brush, Suffolk County investigators discovered six additional sets of human remains representing six more victims. Several were partial remains; several had been deposited years earlier than the Gilgo Four. The body of Shannan Gilbert herself, whose disappearance had occasioned the searches in the first place, was found in December 2011 in a marsh in Oak Beach — approximately four miles from the Gilgo Four discovery sites. The Suffolk County Medical Examiner ruled Gilbert's death an accidental drowning; her family has contested this ruling continuously since 2011. The Suffolk County investigation through the 2010s was substantially disrupted by the December 2015 arrest and 2016 federal conviction of Suffolk County Police Chief James Burke for an unrelated prisoner assault and conspiracy to cover up the assault — Burke had been Chief of Detectives during the early Gilgo investigation and had displaced the FBI from a 2012 cooperative role. In February 2022 Suffolk County District Attorney Raymond Tierney established a dedicated Gilgo Beach Homicide Task Force. On July 13, 2023, the task force arrested Rex A. Heuermann, 59, a licensed architect with an office on West 36th Street in Manhattan and a home on First Avenue in Massapequa Park. The initial indictment charged him with the killings of Barthelemy, Waterman, and Costello (the "Gilgo Three"). Subsequent indictments through 2024 and 2025 have added Brainard-Barnes, Karen Vergata, Jessica Taylor, and Sandra Costilla. Heuermann has pleaded not guilty. Pre-trial proceedings, including substantial defense and prosecution motions over the admissibility of computer evidence and the application of New York State serial-murder enhancement statutes, are continuing as of May 2026.

The documented record.

The Shannan Gilbert disappearance

The case begins with a missing-person investigation. Verified Shannan Gilbert, 24, of Jersey City, was a Craigslist escort who had traveled to Oak Beach, a small gated community on the bay side of Jones Beach Island, on the night of May 1, 2010 to meet a client. At approximately 4:50 a.m. on May 2, Gilbert ran from the client's house in apparent panic, knocked on the doors of several neighbors, and placed a 23-minute 911 call before fleeing into the marsh behind the community. She was not seen alive again. Her car was found that morning. The Suffolk County Police Department's initial response to her client's missing-person report and to her mother Mari Gilbert's subsequent calls was, in the family's documented complaint, slow and dismissive [1].

The cadaver-dog searches that began in December 2010 — seven months after Gilbert's disappearance — were conducted along Ocean Parkway in the area where her phone had last pinged. They did not find Gilbert. They found, instead, the bodies of the Gilgo Four. Gilbert's remains were discovered in December 2011 in a different location, in a marsh in Oak Beach. Verified

The Gilgo Four discoveries (December 2010 - April 2011)

The four initial sets of remains discovered between December 11 and December 15, 2010, were identified through dental and DNA records. Verified All were young women who had been working as Craigslist or Backpage escorts at the time of their disappearance:

• Melissa Barthelemy, 24, of Buffalo. Disappeared July 12, 2009 after leaving an Erie Boulevard apartment in the Bronx. Discovered in a burlap sack along Ocean Parkway, December 11, 2010 [2].
• Megan Waterman, 22, of Scarborough, Maine. Disappeared June 6, 2010 from a Holiday Inn Express in Hauppauge, Long Island. Discovered along Ocean Parkway, December 13, 2010.
• Maureen Brainard-Barnes, 25, of Norwich, Connecticut. Disappeared July 9, 2007 from a New York City hotel. The longest-missing of the Gilgo Four at the time of her discovery December 13, 2010.
• Amber Lynn Costello, 27, of North Babylon, Long Island. Disappeared September 2, 2010. Discovered December 13, 2010.

The four were deposited in a deliberate spaced pattern along the road, each in burlap material, within a quarter-mile of one another. The disposal pattern was the first piece of evidence that established the case was the work of a single perpetrator [2][3]. Verified

The additional remains (2011, 2017)

Between March 29 and April 11, 2011, searches expanded along Ocean Parkway and across to Jones Beach Island. Verified Six additional sets of human remains were discovered, several of them partial — cross-jurisdictional matches subsequently established that the Suffolk County Gilgo discoveries shared body parts with earlier discoveries from Manorville and Nassau County:

• Jessica Taylor, 20, originally of Washington, D.C. Partial remains had been discovered in Manorville in 2003; additional remains were discovered at Ocean Parkway in 2011 and matched.
• "Peaches", 20-30, an unidentified Black woman whose partial remains had been discovered at Hempstead Lake State Park in 1997. Additional partial remains discovered in 2011 and matched. "Peaches" remained unidentified until 2024 when she was identified through investigative genetic genealogy as Tanya Denise Jackson; her toddler daughter, found dismembered with her, was identified as Tatiana Marie Dykes.
• "Baby", a toddler, the daughter of "Peaches"/Tanya Jackson. Discovered 2011, identified 2024.
• "Asian Doe", an Asian male presenting as female (per medical examiner's report), 17-23. Discovered 2011. Identified in 2020 via genetic genealogy as Karen Vergata, who had disappeared in 1996.
• Valerie Mack (formerly "Jane Doe #6"), 24, originally of Philadelphia. Disappeared 2000. Partial remains discovered in Manorville 2000; additional remains 2011 at Ocean Parkway. Identified 2020 via genetic genealogy.
• "Fire Island Jane Doe", female, partial remains. Discovered 2011; remains unidentified as of 2026.

An eleventh confirmed Long Island Serial Killer victim, the partial remains of an unidentified woman discovered at Tobay Beach in 2017, was added to the case in 2020 [3][4]. Verified

The Burke disruption (2012-2016)

The Suffolk County investigation during its first years was substantially compromised by institutional dysfunction. Verified James Burke, who became Chief of Detectives of the Suffolk County Police Department in 2012, displaced the FBI from a cooperative role in the Gilgo investigation in 2012, reportedly over personal hostility toward federal agents from his earlier career. The decision was made over the public objections of then-District Attorney Thomas Spota. Federal cooperation on the case did not resume substantively until 2015 [5].

On December 9, 2015, Burke was arrested by the FBI on federal charges arising from his December 2012 assault of an arrestee named Christopher Loeb. In 2016, Burke pleaded guilty to civil-rights and conspiracy charges and was sentenced to 46 months in federal prison. In 2017, then-District Attorney Spota was himself indicted on federal charges in the same broader conspiracy and was subsequently convicted in 2019 (his conviction was upheld on appeal). The combined effect of the Burke-Spota period was the loss of approximately three to four years of investigative cooperation and continuity in the Gilgo case [5][6]. Verified

The Tierney task force and the Heuermann arrest

In February 2022, newly-elected Suffolk County District Attorney Raymond A. Tierney established an inter-agency Gilgo Beach Homicide Task Force with the Suffolk County Police Department, the New York State Police, the FBI, and the Nassau County Police Department. Verified The task force's first reported breakthrough was the linkage of a green Chevrolet Avalanche pickup truck — identified by a witness to Amber Lynn Costello's last known sighting in 2010 — to Rex Heuermann, a then-59-year-old licensed architect with an office on West 36th Street in Manhattan and a home at 942 First Avenue in Massapequa Park. Heuermann had owned an Avalanche at the relevant period; the witness identification, combined with subsequent investigative work including computer-search records, telephone records, and DNA analysis from a piece of pizza-crust trash recovered from his Manhattan office building, produced an evidentiary case sufficient for arrest [7].

Heuermann was arrested on July 13, 2023. The initial Suffolk County indictment charged him with the murders of Melissa Barthelemy, Megan Waterman, and Amber Lynn Costello — the "Gilgo Three." Subsequent superseding indictments added Maureen Brainard-Barnes (January 2024), Karen Vergata (June 2024), Jessica Taylor (December 2024), and Sandra Costilla (December 2024 — an additional 1993 victim newly attributed to the case through the investigation). The total of seven Heuermann charges as of May 2026 represents the largest single charging set in the case [7][8]. Verified Heuermann has pleaded not guilty to all counts.

The Shannan Gilbert death (separate ruling)

Shannan Gilbert's December 2011 discovery in the Oak Beach marsh was treated by Suffolk County investigators as separate from the Long Island Serial Killer case. Disputed The Suffolk County Medical Examiner's office ruled the death an accidental drowning, attributing it to disorientation in the marsh during what the office characterized as a possible drug-influenced psychotic episode. An independent autopsy commissioned by the Gilbert family by forensic pathologist Michael Baden in 2016 reported findings (specifically, hyoid bone damage) consistent with possible strangulation. The Gilbert family has continuously contested the Suffolk County ruling. The 911 call recording, eventually released in 2017, contains content (her statement "they're trying to kill me") that the family argues supports a homicide interpretation [1][9]. Disputed No charge has been brought in the Gilbert death.

The principal disputed elements.

The "two killer" theory (pre-2023)

Through the 2010s, multiple investigators and journalists advanced the theory that the Ocean Parkway remains represented the work of more than one killer. Disputed The argument: the four Gilgo Four victims were deposited together in a tight pattern, while the additional remains were distributed differently and included victims (Jessica Taylor in 2003, "Peaches" in 1997) who predated the Gilgo Four by years; the disposal methods differed; the victim profiles differed in detail. The single-killer counter-argument turned on the cross-jurisdictional body-part matches and the absence of forensic evidence of a second perpetrator. The 2023 Heuermann arrest and the subsequent forensic case-building have substantially eroded the two-killer theory as applied to the indicted victims; whether all eleven of the Ocean Parkway / Jones Beach Island remains can be attributed to a single perpetrator remains substantively unresolved [3].

The Suffolk County dysfunction question

The claim, widely advanced in investigative journalism and acknowledged in part by the post-Burke administration: that the Burke-Spota period actively suppressed the Gilgo investigation, possibly to protect a politically-connected suspect. Disputed The institutional dysfunction is documented; whether that dysfunction reflected a deliberate cover-up or the broader corruption later prosecuted on unrelated charges is unresolved. No documentary evidence of deliberate Gilgo-specific suppression has been produced [5][10]. The Tierney task force's 2022 launch and the subsequent Heuermann arrest are themselves arguments against the strongest forms of the cover-up theory.

The Shannan Gilbert ruling

The Suffolk County ME's accidental-drowning ruling continues to be contested by the Gilbert family. Disputed The Baden re-autopsy findings, combined with the unexplained circumstances of her flight from the Oak Beach client's house and her 911 call content, support an alternative homicide interpretation. The Suffolk County position has not been formally revisited despite the 2022 task force's broader case reexamination. The Gilbert death, if it were a separate homicide, would represent a distinct case from the Heuermann-charged killings; the geographic and temporal proximity, however, has kept the question entangled with the Long Island Serial Killer investigation [1][9].

The unanswered questions.

The unindicted victims

As of May 2026, Heuermann has been charged with seven of the eleven LISK victims. The four remaining — Valerie Mack, "Peaches"/Tanya Jackson, the toddler "Baby"/Tatiana Marie Dykes, and the Tobay Beach Jane Doe — have not yet been added to the indictment. The Suffolk County DA's office has indicated that additional charges are possible; whether the four remaining victims are part of the same perpetrator's pattern or represent additional perpetrators is undetermined on the public record.

The remaining unidentified

At least one of the LISK victims (the Fire Island Jane Doe / Tobay Beach Jane Doe set) remains unidentified as of 2026. Modern investigative genetic genealogy has identified four previously-unidentified victims since 2020; the techniques are being applied to remaining DNA-recoverable material. The continuing failure to identify these victims constrains the case's reconstruction of the killer's geographic and temporal range.

The 1996 starting point

The 1996 disappearance of Karen Vergata (identified 2020) represents, at present, the earliest confirmed LISK killing. The Sandra Costilla 1993 victim, added in the December 2024 superseding indictment, would extend the range earlier. Whether earlier victims exist — particularly in the Manorville and South Shore beach areas during the early to mid-1990s — is an open investigative question.

The Shannan Gilbert death

The continuing dispute over the Gilbert death is unresolved. Disputed A definitive reinvestigation under the post-2022 task force would either confirm or contest the original Suffolk County ME finding; no such formal reinvestigation has been announced. The death's relationship to the broader LISK case — whether Gilbert was an unrelated tragedy whose disappearance happened to occasion the search that uncovered the Ocean Parkway remains, or whether she was a separate victim of the same or a related perpetrator — is open.

The trial

The Heuermann pre-trial proceedings are continuing. Defense motions over the admissibility of the computer-search records (which include extensive sex-work-related searches and what prosecutors have characterized as a "planning document" found on a computer device) and over the application of New York State serial-murder enhancement statutes are pending. The trial date as of May 2026 has not been finalized.

Primary material.

• Suffolk County Police Department, Long Island Serial Killer / Gilgo Beach case files, 2010-present.
• Suffolk County Medical Examiner's Office autopsy reports on the eleven identified and unidentified Ocean Parkway / Jones Beach Island remains.
• Suffolk County District Attorney's Gilgo Beach Homicide Task Force indictment files, July 2023 - present.
• FBI Long Island Resident Agency materials on the Gilgo investigation (partial public release through criminal-trial discovery).
• The Shannan Gilbert 911 call recording (released 2017) and the Suffolk County investigative file on the Gilbert death.
• Michael Baden's 2016 independent autopsy report on Shannan Gilbert, commissioned by the Gilbert family.
• U.S. Department of Justice case files on the prosecution of former Suffolk County Police Chief James Burke (2015-2016) and former District Attorney Thomas Spota (2017-2019).
• Heuermann pre-trial discovery materials released to the public docket, including the prosecution's "planning document" allegations.

The sequence.

1. 1993-1996 Earliest confirmed LISK killings as charged in 2024 superseding indictments: Sandra Costilla (1993), Karen Vergata (1996, identified 2020). "Peaches" likely killed mid-1990s; identified 2024 as Tanya Denise Jackson.
2. 2003 Partial remains of Jessica Taylor discovered in Manorville; matched to 2011 Ocean Parkway discoveries.
3. 2007-2010 Disappearances of Maureen Brainard-Barnes (2007), Melissa Barthelemy (2009), Megan Waterman (June 2010), Amber Lynn Costello (September 2010).
4. May 1, 2010 Shannan Gilbert disappears at Oak Beach after a 23-minute 911 call.
5. December 11-15, 2010 Suffolk County Police K-9 search discovers the four "Gilgo Four" sets of remains along Ocean Parkway. Identifications within weeks through dental and DNA records.
6. March-April 2011 Expanded searches discover six additional sets of remains along Ocean Parkway and Jones Beach Island. Cross-jurisdictional body-part matches established with the earlier Manorville and Hempstead Lake discoveries.
7. December 13, 2011 Shannan Gilbert's remains discovered in the Oak Beach marsh, approximately seven months into the Gilgo searches.
8. 2012 Suffolk County Police Chief of Detectives James Burke displaces the FBI from cooperative role in the Gilgo investigation.
9. December 2015 Burke arrested by FBI on federal civil-rights charges arising from a 2012 prisoner assault.
10. 2016 Burke pleads guilty; sentenced to 46 months federal prison. Michael Baden's independent re-autopsy of Shannan Gilbert reports findings consistent with possible strangulation.
11. 2017 Suffolk County DA Thomas Spota indicted on federal charges. Eleventh LISK victim, the Tobay Beach remains, added to the case (later, in 2020).
12. 2019 Spota convicted; conviction upheld on appeal.
13. 2020 Genetic genealogy identifies Valerie Mack and Karen Vergata.
14. February 2022 Suffolk County DA Raymond Tierney establishes inter-agency Gilgo Beach Homicide Task Force.
15. July 13, 2023 Rex Heuermann arrested at his Manhattan office. Initial indictment: Barthelemy, Waterman, Costello.
16. January 2024 Superseding indictment adds Maureen Brainard-Barnes.
17. 2024 Tanya Jackson and Tatiana Marie Dykes identified.
18. June 2024 Superseding indictment adds Karen Vergata.
19. December 2024 Superseding indictment adds Jessica Taylor and Sandra Costilla. Heuermann charged with seven of the eleven LISK victims as of this date.
20. May 2026 Pre-trial proceedings continuing. Trial date pending.

Cases on this archive that connect.

The Zodiac Killer (File 008) — the comparable unsolved serial-killer case from an earlier era. The Long Island case represents the parallel pattern with a different outcome: where the Zodiac investigation produced a list of unconfirmed suspects without an arrest, the Long Island investigation eventually produced an arrest decades after the killings began.

The Black Dahlia (File 033) — the canonical unsolved Los Angeles single-victim case with a comparable institutional-failure profile. The Long Island investigation displays many of the same patterns at scale.

The Boy in the Box (File 030) — the unsolved case that was finally identified through investigative genetic genealogy. The Long Island case has now identified four previously-unidentified victims through the same technique; the methodology bridges the two cases.

D.B. Cooper (File 034) — the structural inverse of the Long Island case: a single-event mystery with no body and continuing investigative interest, versus a multi-victim case with bodies and a long delay to arrest.

Full bibliography.

1. Suffolk County Police Department, missing-persons file on Shannan Maria Gilbert, opened May 2010. Includes the 23-minute 911 call recording, released to the family 2017.
2. Suffolk County Medical Examiner's Office, autopsy reports on Melissa Barthelemy, Megan Waterman, Maureen Brainard-Barnes, and Amber Lynn Costello, December 2010.
3. Kolker, Robert. Lost Girls: An Unsolved American Mystery. Harper, 2013. The definitive pre-arrest journalistic treatment of the Gilgo Four and the early Suffolk County investigation.
4. Suffolk County Medical Examiner's Office, autopsy reports on the six additional remains discovered March-April 2011, and on the Tobay Beach 2017 remains.
5. U.S. District Court, Eastern District of New York, United States v. James Burke, 2015-2016. Court records of the Burke federal prosecution.
6. U.S. District Court, Eastern District of New York, United States v. Thomas Spota, 2017-2019. Court records of the Spota federal prosecution.
7. Suffolk County District Attorney's Office, indictment of Rex A. Heuermann, July 13, 2023, and superseding indictments January 2024, June 2024, December 2024.
8. Tierney, Raymond A. Public statements and press conferences of the Suffolk County District Attorney's Gilgo Beach Homicide Task Force, 2022-present.
9. Baden, Michael. Independent autopsy report on Shannan Maria Gilbert, commissioned by Mari Gilbert, December 2015 - February 2016.
10. Burke, Kerry, and the New York Daily News investigative team. Long-running coverage of the Suffolk County investigation, 2010-2023.
11. Maczkowicz, Joseph. The Gilgo Beach Killer: A Story of Murder and Mayhem on Long Island. WildBlue Press, 2024. Includes the post-arrest reconstruction of the Heuermann case-build.
12. Investigative genetic genealogy reports on the identifications of Valerie Mack (2020), Karen Vergata (2020), Tanya Denise Jackson and Tatiana Marie Dykes (2024). Suffolk County DA's office and Nassau County Police Department releases.