"That was not nice, so do I get credit for next time." That text message — sent from a burner phone after a failed scam at a West Babylon house in September 2010 — sat in phone records for over a decade. It was sent to Amber Costello, a 27-year-old escort, after her roommate scammed a client out of cash. The next night, the same phone contacted Amber again. She walked out to meet the man. Her roommate saw a dark-colored Chevrolet Avalanche. Amber was never seen again.

Episode 7 of "The Seven" — the final installment. That truck description is what cracked the Gilgo Beach case. When the task force ran it through registration records in 2022, Rex Heuermann's name came back. From there — surveillance, the pizza-crust DNA, the house searches, the planning document, the arrest.

Amber was from North Carolina, battling heroin addiction, living with roommates in West Babylon. Friends called her quirky, goofy, generous. Her sister said she forgives Heuermann. Without Amber's case — the witness, the truck, the text, the cell tower data — the Gilgo Beach investigation might still be cold. Her story, the evidence, and how the last known victim became the one that broke everything — all covered here.

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