The investigation into the Gilgo Beach serial killings has reached a new grim milestone as Rex Heuermann, the New York architect accused of the murders, faces charges in the death of a seventh woman. This latest development further deepens the connection to Western New York, as the case includes Buffalo-area native Melissa Barthelemy, one of the first victims identified in the decade-long investigation.
New Charges in the Death of Valerie Mack
Rex Heuermann has been formally charged with the murder of Valerie Mack, a 24-year-old woman whose remains were initially discovered in Manorville, New York, in 2000. Mack, who was working as an escort in Philadelphia at the time of her disappearance, was last seen by her family in New Jersey that same year. For two decades, her identity remained a mystery until genetic testing in 2020 provided a breakthrough for investigators.
The forensic link in Mack’s case is particularly striking. Earlier this year, human hair found with her remains was subjected to advanced DNA profiling. Results indicated a likely match with the genetic profile of Heuermann’s daughter. While his daughter is not a suspect and would have been a toddler at the time of the crime, the presence of the DNA suggests a link to the Heuermann household.
Overview of Charges Against Rex Heuermann
Since his initial arrest in July 2023, the scope of the case against Heuermann has expanded significantly. The following table outlines the victims currently linked to the defendant by the Suffolk County District Attorney’s Office:
| Victim Name | Discovery Date | Regional Connection |
|---|---|---|
| Melissa Barthelemy | December 2010 | Western New York Native |
| Amber Lynn Costello | December 2010 | Long Island, NY |
| Megan Waterman | December 2010 | Maine |
| Maureen Brainard-Barnes | December 2010 | Connecticut |
| Sandra Costilla | November 1993 | New York City |
| Jessica Taylor | July 2003 / March 2011 | New York City |
| Valerie Mack | Sept 2000 / April 2011 | New Jersey / Philadelphia |
Western New York Connection: Melissa Barthelemy
For residents of Western New York, the Gilgo Beach case hits close to home. Melissa Barthelemy, one of the “Gilgo Four” whose remains were found near one another in 2010, grew up in the Buffalo region. Her family’s long search for justice has been a focal point of regional news coverage for years. William Strasmore and the Lake Erie Times team continue to monitor how these new charges against Heuermann may bring further closure to the Barthelemy family and the broader WNY community.
The “Blueprint” for Murder
The prosecution’s case is bolstered by chilling evidence recovered from a hard drive found in Heuermann’s Massapequa Park home. Investigators allege the drive contained a file used to “methodically blueprint” the killings. This document reportedly included checklists for disposing of evidence and “lessons learned” to avoid detection in future crimes.
Heuermann has maintained a plea of not guilty to all counts. He remains in custody as his legal team prepares for a complex trial that involves decades of forensic evidence and thousands of investigative tips.
Expanding the Investigation
The Suffolk County District Attorney’s Office is not stopping at these seven victims. Authorities are currently re-examining other unsolved cases, including the death of Karen Vergata, whose remains were identified in 2022. Additionally, new renderings were recently released for an unidentified victim found in 2011, as law enforcement seeks to provide names to all those whose lives were lost in this decades-long tragedy.
For more updates on this story and other regional legal developments, stay connected with Lake Erie Times.
