Forensic psychologist Katherine Ramsland, who spent five years communicating with BTK after he was incarcerated, tells the chilling story of how an ordinary farm boy became a bloodthirsty killer.
After his mother is strangled in an unsolved murder, devastated Jeffrey Davis receives two highly disturbing letters -- read publicly for the first time -- from the same mysterious author, who would eventually be revealed as BTK.
Detectives take viewers on a journey into the psychopath's mind by sharing examples of how BTK meticulously cataloged his fantasies and crimes.
After years of anguish, BTK's daughter, Kerri Rawson, finally speaks and writes about what it was like to learn her beloved father is actually a notorious serial killer.