Alexis and Billy examine all the theories in the case, from how many killers are out there to who the leading suspects are—as well as share their personal thoughts on what went wrong during the investigation and who the LISK is. To follow our investigation even further, stream the special "Unraveled: The Long Island Serial Killer" exclusively on discovery+. Go to discoveryplus.com/UNRAVELED to start your 7-day free trial today.*
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