Ocean Parkway, Long Island. April 8, 2026. Rex Heuermann — a 61-year-old architect from Massapequa Park who ran his Manhattan firm four blocks from One World Trade Center — pleaded guilty to eight murders spanning 17 years. From Sandra Costilla in 1993 to Amber Lynn Costello in 2010. He admitted to strangling all eight. Three were bound in burlap before being left in the brush along Ocean Parkway. The detail that changed how investigators understood him: On his devices, they found a document he had written himself. It outlined how to commit serial murder, how to dispose of a body, how to avoid leaving DNA evidence, and what supplies to bring. He had been studying it. He had documented it. His wife Asa Ellerup said she had no knowledge. She filed for divorce the day he was arrested. Shannan Gilbert — whose disappearance and 911 call in 2010 brought police to Ocean Parkway and led to the discovery of the other victims — was ruled an accidental drowning. She is not among his eight confirmed victims. Her family disputes the ruling. Her case remains separately unresolved. Several victims found along Ocean Parkway still have no names. The investigation into whether Heuermann had additional victims continues. Sandra Costilla. Melissa Barthelemy. Megan Waterman. Maureen Brainard-Barnes. Amber Lynn Costello. Valerie Mack. Jessica Taylor. Karen Vergata. If you need help — reach out. You are not alone. How many more are there — and how many names along that road are we still waiting to recover? #gilgobeach #rexheuermann #LISK #truecrime #oceanparkway #guiltyPlea2026 #shannangilbert #longisland #GraveFileTV #truecrimedocumentary #update #serialkiller PINNED COMMENT — EPISODE 28: He wrote a document on how to commit serial murder. Not notes. Not rough thoughts. A structured document outlining methodology — how to kill, how to dispose, how to avoid DNA, what supplies to bring. Found on his devices when investigators searched them. He had studied this. He documented it. He filed it. Asa Ellerup — his wife of over 20 years — said she had no knowledge. She filed for divorce the day he was arrested. He had been driving to Long Island on weekends. For 17 years. Shannan Gilbert's 911 call in 2010 started everything. Police searching for her found the others. She is not among his confirmed victims. Her family disputes the accidental drowning ruling. Her case is still separately unresolved. Some found along Ocean Parkway still have no names. Sandra Costilla. Melissa Barthelemy. Megan Waterman. Maureen Brainard-Barnes. Amber Lynn Costello. Valerie Mack. Jessica Taylor. Karen Vergata. 🕯️ How many more names are still in that brush? #gilgobeach #rexheuermann #truecrime #GraveFileTV