Sexual sadists are addicted to the thrill of inflicting pain before killing their victims. An analysis contrasts the psyches of David Parker Ray and Dennis Rader
Some serial killers are driven by a hatred for humankind, while others seek revenge for their abusive childhoods; some simply love to kill. Examining the cases of Israel Keyes, Anatoly Onoprienko and Dennis Nielsen
This is a shockingly common breed of serial killer: doctors and nurses who kill patients for a twisted reasons. Examining the cases of Harold Shipman, Donald Harvey and Maria Fikácková
These are the most excessive serial killers who murder, often crossing over into horrible perversions. Examining the cases of Peter Sutcliffe, David Berkowitz and Jeffrey Dahmer
These killers who work as a team; monsters who feed off each other's warped psyches to commit murders. Ian Brady and Myra Hindley, Gerald and Charlene Gallego, Fred and Rosemary West
