with 4 episodes premiered on November 4, 2021

with 4 episodes premiered on February 9, 2022

The detectives who captured the BTK Killer and other notoriously brutal murderers recount the brave actions and burdens behind their investigations.

with 4 episodes premiered on June 23, 2023

Real-life investigators recount stories of cold-blooded killers, the desperate efforts to stop them and the brave people who brought them to justice.