The Polygon and the Avalanche: How the Gilgo Beach Suspect Was Found

They called it the polygon. Using phone records and a sophisticated system that maps the reach of cell towers, a team of investigators had drawn the irregular shape across a map of tree-lined streets in the Long Island suburb of Massapequa Park, New York. By 2021, the investigators had been able to shrink the polygon so that it covered only several hundred homes. In one of those homes, the investigators believed, lived a serial killer. Sign up for The Morning newsletter from the New York Times A

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