John Douglas on chasing serial killers

The Minds Behind Mindhunter

The Different Types Of Serial Killer | The FBI Files

Inside the Mind of BTK by John Douglas - Audiobook - Part 1

Donald Harvey interviewed by Criminal Profiler John Douglas (MSNBC)

The real-life 'Mindhunter' reveals the most evil criminals he's interviewed | Your Morning

Know Their Motive | John Douglas Teaches How to Think Like an FBI Profiler | MasterClass