Rex Heuermann and Sandra Costilla: DNA Bridging Gilgo to 1993

Sandra Costilla changes everything about the Gilgo Beach case. If you thought the killings started in 2007, prosecutors say you're off by 14 years. Sandra was found in the woods of Southampton in November 1993 — not on Gilgo Beach, not along Ocean Parkway, but 60 miles east, in a location nobody connected to the pattern until prosecutors applied advanced DNA technology to hairs found on her body. The results, according to the indictment: a 99.96 percent match to Rex Heuermann.

Episode 1 of "The Seven" — one episode per victim, starting with the earliest alleged case and building chronologically through to Amber Costello.

Sandra's case is the thinnest in publicly known evidence — the defense called it a single hair on a shirt — but it may be the most significant in terms of what it reveals. If Heuermann was allegedly killing in 1993, he was doing it before the marriage, before the children, before the suburban life prosecutors say gave him cover. And the seven-year gap between Sandra and the next known victim, Valerie Mack in 2000, raises questions prosecutors haven't publicly answered. The evidence, the defense challenge, the judge's ruling, and what Sandra's case means for understanding the full alleged scope — all covered here.

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This publication contains commentary and opinion based on publicly available information. All individuals are presumed innocent until proven guilty in a court of law. Nothing published here should be taken as a statement of fact, health or legal advice.

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