Psychologist and professor Fathali Moghaddam spoke with A&E True Crime to unpack the motivations behind people who kidnap and abduct.

Dr. Richard Lettieri, a forensic neuropsychologist and psychoanalyst who's assessed hundreds of murderers throughout his career, talks to us about his most memorable cases and his book, 'Decoding Madness.'

We speak with author Mikita Brottman on her book 'Couple Found Slain: After a Family Murder' about the Brian Bechtold case and the grim daily reality of patients in forensic psychiatric hospitals.

Eddie Seda, Matthew Milat and Michael Madison are just a handful of killers who claim to have been inspired by other killers.