Who Was Sandra Costilla Before Rex Heuermann Pleaded Guilty To Her Murder?

Sandra Costilla was twenty-eight years old when her remains were found in the woods of Southampton, Long Island, in 1993. For thirty years, her case sat cold. Investigators pursued the wrong suspect. Nobody connected her death to the Gilgo Beach killings. And then DNA technology that didn't exist during her lifetime linked her to Rex Heuermann — and pushed the entire timeline of his alleged crimes back by fourteen years.

This look back puts Sandra first — her life before the case file, the decades her family spent without answers, and the forensic breakthrough that finally brought her name back into the investigation. Before Sandra's connection was established, the Gilgo Beach killings were understood to have begun around 2007. Her case changed the scope of everything investigators believed about how long Heuermann had been operating.

Heuermann eventually pleaded guilty to Sandra's murder along with six others, and admitted to an eighth killing as part of the agreement. He confirmed strangulation as the cause of death for each victim. The defense had tried to exclude the DNA evidence that connected him to Sandra — matched through advanced whole genome sequencing — and the judge ruled it admissible. He is expected to be sentenced to three consecutive life terms plus an additional hundred years. We revisit where the case stood at the time of our reporting. Sandra waited thirty years for someone to say her name in a courtroom connected to the person who took her life. This segment says it first.

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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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