The Delphi Murders: The Quest To Find 'The Man On The Bridge'

On February 13, 2017, two Indiana teenagers, Abigail Williams, 13, and Liberty German, 14, went for a walk in the woods near the abandoned Monon High Bridge.

They never returned home. Their bodies were discovered on Valentine's Day morning, sparking a torrent of news coverage and social media speculation that engrossed the attention of people around the world.

A grainy photo of the suspected killer walking across the bridge and a chilling cellphone recording of his voice saying "down the hi...