In a lot of cold cases, the investigators don't know the identity of the killer. When the List family was wiped out, the police knew exactly who killed them. But it would still take them nearly two decades to bring them to justice. 

Fact checker, Producer and Sound Designer - Danelle Cloutier 
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Intro and Outro Music: Scary Theme by Eitan Epstein Music
Main Song: Abandoned Hospital SPMusicGroup
Sources: https://pastebin.com/X25s5kKP