Long Island Gilgo Beach Serial Killer Arrested

July 15, 2023 Samuel Culper

Accused Giglo Beach killer Rex Heuermann matches the description of the john investigators have been searching for since victim Amber Lynn Costello went missing in 2010.

Heuermann, 59, allegedly paid Costello for sex services the day before she disappeared, but was chased off by an individual posing as her significant other “with the purpose of making that individual uncomfortable having them leave without retrieving his money,” Suffolk County District Attorney Ray Tierney said during a press conference Friday.

Heuermann, who was not identified by name at the time, was described by witnesses as a white man between 6’4 and 6’6 with dark hair and glasses.

“Also of significance was the fact that he was driving a dark-colored or black first-generation Chevrolet Avalanche,” Tierney said.

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When police zeroed in on Heuermann in 2022, they noticed he matched the john’s description to a T.

“Right away, there was some commonalities that came right to the forefront,” Tierney said.

“Rex is 6’6 — a large person, not necessarily muscular, very physically large person. He has glasses. He has that dark hair, and also a particular note: he owned, at the time, that first-generation Chevy Avalanch.”

Additionally, investigators matched his Massapequa Park home and his Manhattan business addresses to cell towers pinged by burner phones used by the alleged killer.

Heuermann has pleaded not guilty to a slew of charges — including three counts of first-degree murder — related to the deaths of Melissa Barthelemy, Megan Waterman and Amber Costello.