The Case That Made Investigators Physically Sick | Lizzi Marriott's Disappearance (2026)

In October 2012, 19-year-old UNH student Lizzi Marriott agreed to meet someone she'd connected with online — and was never seen alive again. Her body was never found. This true crime documentary covers the full story: the disappearance, Seth Mazzaglia's disturbing confession, and how investigators pieced together a murder with no body. One of the most chilling cold cases in New England history. Some images in this video are AI-generated representations created for illustrative purposes. Hit that LIKE button! ► Grab a True Crime Stories T-Shirt → https://bit.ly/TCSmerch ► Grab a new TCS mug or decal! → https://tynotts.com ► Join the channel for perks! → https://bit.ly/3V6gSF7 Chapters: 00:00 Intro 00:42 Beginning 02:24 Lizzie Goes Missing 04:49 The Investigation 07:10 The Plot Thickens 13:48 A Deadly Game of Poker 19:15 The Sentencing My name is Ty Notts and I'm a freelance cold case detective who investigates unsolved mysteries and unexplained crimes, posting them as crime documentaries. Here on True Crime Stories, I cover true crime cases you've never heard of. I also post new true crime documentaries each week, so follow for more! Mysterious scary stories like this are sure to leave you baffled when you hear about what this scary person has done. #TrueCrime #TrueCrimeDocumentary #LizziMarriott #ColdCase #TrueCrimeStories