Expert FBI profiler John Douglas shares how he turned the sophisticated and cruel tactics of murderer Larry Gene Bell against him.

We spoke with legendary FBI profiler John Douglas about how a childhood injury may have pushed Joseph Paul Franklin to serial murder.

There was nothing on the surface that raised red flags about Robert Hansen. The unassuming Anchorage native was married with children and was the successful owner of a bakery. But Hansen eventually confessed to killing 17 women in the Alaskan wilderness in a most heinous way.

Israel Keyes—a murderer who perplexed even the FBI's top minds in criminal profiling—traveled America leaving 'kill kits' with weapons and other items in secluded locations, picking them up before abducting and murdering a chosen victim.

Former FBI special agent John Douglas spent his 25-year career with the Bureau interviewing hundreds of America's most infamous killers, from Charles Manson and Ted Bundy to the 'BTK Killer,' Dennis Rader and more. The 'Mindhunter' author talks to us about his new book, 'The Killer Across the Table,' and his tried-and-true interview techniques.