Rex Heuermann fought for nearly three years. His defense challenged the DNA. Filed motion after motion. Lost every single one. Then he stood in a Suffolk County courtroom and pled guilty to murdering seven women — and admitted to killing an eighth. Life without parole. No trial. No jury. No public cross-examination. The families who waited decades for answers got a plea hearing instead of the reckoning a trial would have provided. Retired FBI Special Agent Jennifer Coffindaffer breaks down what a sudden plea reversal from a defendant who fought this hard actually signals, what the families gain and lose when a case ends without a trial, and what happens to the remaining unresolved cases connected to the Gilgo Beach investigation — because Heuermann was charged with seven of the deaths and admitted to an eighth, but additional sets of remains were found in the area. Then we go back to where it all started — Sandra Costilla. She was 28 years old when her body was found in the woods of Southampton, Long Island, in 1993. For three decades, nobody connected her death to the Gilgo Beach case. Investigators looked at the wrong suspect for years. Meanwhile, according to prosecutors, the man whose DNA was allegedly on her body was living undisturbed on Long Island — building a career, raising a family, and allegedly continuing to harm other women for nearly two more decades. Sandra's case rewrote the entire timeline. Before prosecutors linked her to Heuermann, the Gilgo Beach killings were understood to begin in 2007. Sandra pushes it back by 14 years. The DNA evidence — matched through advanced technology that didn't exist during her lifetime — tied Heuermann to her with near-certainty. The defense tried to get it thrown out. The judge ruled it admissible. This is Episode 1 of "The Seven" — one victim per episode, their story first, the evidence second. Sandra Costilla deserved to be more than a case number. She waited 30 years. Now her name is part of the record. Join Our SubStack For AD-FREE ADVANCE EPISODES & EXTRAS!: https://hiddenkillers.substack.com/ Want to comment and watch this podcast as a video? Check out our YouTube Channel. https://www.youtube.com/channel/UC8-vxmbhTxxG10sO1izODJg?sub_confirmation=1 Instagram https://www.instagram.com/hiddenkillerspod/ Facebook https://www.facebook.com/hiddenkillerspod/ Tik-Tok https://www.tiktok.com/@hiddenkillerspod X Twitter https://x.com/TrueCrimePod 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. #RexHeuermann #SandraCostilla #GilgoBeachKiller #LISK #GuiltyPlea #GilgoBeach #TheSeven #LongIslandSerialKiller #TrueCrime #HiddenKillers