Long Island, May 2010. A 24-year-old [music] woman named Shannon Gilbert placed a frantic 911 call from a client's home in Oak Beach. Then she ran barefoot down the highway banging on strangers' doors. She was never seen alive again. Police searched [music] for her along Ocean Parkway, the narrow highway running between the cold Atlantic and the scrub [music] brush of Long Island's barrier beach. They did not find Shannan Gilbert. They found something else. In December [music] 2010, in the brush beside Ocean Parkway, investigators found [music] four sets of human remains. All young women, all bound in burlap [music] and left in the scrub. All had advertised escort services online. All had [music] been strangled. They became known as the Gilgo four. The search widened. The highway was searched for miles. [music] 11 sets of human remains in total. One highway, one killer. The investigation went cold. A decade passed. The highway looked the same in 2021 as it [music] had in 2010. Then in January 2022, a new task force launched. 300 [music] subpoenas, hundreds of warrants, phone location data, cell tower records, DNA from hairs found at a house in Massapequa [music] Park. The hairs matched victims found in that brush. On July 13th, 2023, [music] investigators arrested Rex Heuermann, an architect, 59 years [music] old. He ran his firm four blocks from One World Trade Center. He drove a Chevy Avalanche home to Long Island on weekends. But here is what investigators found on his devices. A document he had written himself, a planning [music] document. It outlined how to commit serial murder, how to dispose of a body, how to avoid leaving DNA, what supplies [music] to bring. He had not stumbled into this. He had studied it. On April 8, 2026, Rex Heuermann [music] stood in Suffolk County Court and pleaded guilty to eight murders spanning 17 years. From 1993 [music] to 2010, his wife had filed for divorce. She said she had no idea. Shannon Gilbert, whose midnight run along that highway started the search that found [music] everyone else, was not among his victims. Her case remains [music] separately unsolved. Some victims found along Ocean Parkway still have no names. Hello, Grave File TV. A new investigation [music] every week because the cases that get shared are the ones that [music] don't get forgotten.