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Watch 48 Hours Season 18 Episode 9 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

It's a real-life Halloween shocker in idyllic Napa, Calif. when two young women are brutally murdered in 2004. Just hours after the last trick-or-treater left their home, former beauty queen Leslie Mazzara and her roommate, Adriane Insogna, were found stabbed to death in their upstairs bedrooms. A third roommate, sleeping downstairs, was not harmed and was the only witness. Who wanted these young women dead? After almost a year of heavy investigating, one clue turns this case inside out and leads to an unlikely suspect who was overlooked by investigators.