The series stars John Walsh and features his son, Callahan Walsh, as an on-the-ground correspondent who works alongside his father at the National Center for Missing and Exploited Children.
He has no known enemies, but when police find a gun, it's clear someone close to Alan is an expert in murder.
This harrowing half-hour archive series revisits some of the most brutal killers in modern history, reviewing news footage and the words of the killers themselves to see which terrifying traits each killer exhibited.
Each hour delves into one story, tracing the time immediately before the individual vanished for critical clues about the disappearance.
The series provides an up-close perspective of the case, including footage from bodycam at the crime scene, surveillance video, and interrogation room video.
Revisit the homicide that gripped the nation, with exclusive interviews and never-before-seen footage from the crime scene.