"Do you know what I did to your sister?"

Amanda Barthelemy was fifteen when she received that call. From her sister Melissa's phone. From a man who called seven times to taunt her about what he'd done to one of the Gilgo Four.

Today we break down the alleged Long Island Serial Killer's hunting methodology—the burner phones, the victim selection, the taunting, and the cell tower evidence prosecutors say ties the Gilgo Beach Killer to every crime.

The seven victims share a pattern. All sex workers. All petite. All advertised on Craigslist. All allegedly contacted via burner phones. All allegedly disappeared when the alleged LISK's family was out of town.

According to court documents, investigators found no instance where Heuermann's personal phone was in a different location than burner phones used to contact the Gilgo Beach victims. The FBI traced calls to cell towers inside "the box"—a small area of Massapequa Park.

Rex Heuermann's house was inside the box.

Suffolk County court documents also allege fake email accounts under names like John Springfield and Thomas Hawk—used to create Tinder profiles and contact sex workers. Under one alias, according to prosecutors, "thousands of searches" were conducted for violent content.

Even in 2022, investigators watched the alleged Long Island Serial Killer add money to burner phones. The alleged methodology never stopped.

And the taunting allegedly continued beyond phone calls. Prosecutors say LISK searched obsessively for the Ocean Parkway investigation. For photos of victims. For photos of their families.

DA Tierney: "His intent was specifically to locate these victims, to hunt them down, to bring them under his control, and to kill them."

Rex Heuermann has pleaded not guilty. The Gilgo Beach trial is September 2026. Part 4 of 5.

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