Long Island, April 8th, 2026. >> [music] >> After nearly 3 years of legal proceedings, Rex Heuermann stood in Suffolk County Court and pleaded guilty. Eight murders, 17 years, from 1993 >> [music] >> to 2010. He admitted to strangling each of them. Three of them bound in [music] burlap before he left them in the brush along Ocean Parkway. Sandra Costilla, [music] Melissa Barthelemy, Megan Waterman, Maureen Brainard-Barnes, Amber Lynn Costello, Valerie Mack, Jessica Taylor, Karen Vergata. Eight names. [music] And then, the detail that changed how investigators [music] understood who they were dealing with. On his devices, [music] they found a document he had written himself. It outlined how to commit serial murder, how to dispose [music] of a body, how to avoid leaving DNA evidence, what supplies to bring. [music] He had studied this. He had documented it. His wife said she had no idea. She filed for divorce. [music] He had been driving to Long Island on weekends for 17 years. Shannon Gilbert's disappearance started everything. Her 911 call brought police to Ocean [music] Parkway. Her search found the others. She was ruled an [music] accidental drowning. Her family disputes it. She is not among his eight confirmed [music] victims. Her case remains separately unresolved. Several victims found along Ocean Parkway still have no names. The investigation [music] into whether he had additional victims continues. He wrote down how to [music] do it. How many more are there? And how many names along that road are we still waiting to recover?