John Douglas on chasing serial killers

The Different Types Of Serial Killer | The FBI Files

The Minds Behind Mindhunter

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

1 Mindhunter- Inside the FBI's Elite Serial Crime Unit | Audiobook True Crime & Thriller

Donald Harvey interviewed by Criminal Profiler John Douglas (MSNBC)

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