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Investigation Discovery continues its heritage of providing in-depth  compelling documentaries & shows.

Investigation Discovery

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.

BTK: Untold Stories

The Serial Killer's Daughter

Detectives take viewers on a journey into the psychopath's mind by sharing examples of how BTK meticulously cataloged his fantasies and crimes.

The Motherlode

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.

The Mysterious Letters

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.

The Mind of a Serial Killer

The serial killer taunts authorities by sending many communications to a WAKE TV in Wichita, Kan., during the 1970s and after re-emerging in 2004.

BTK Is Back

Previously untold stories about American serial killer Dennis Rader who killed 10 people between 1974 and 1991 in the Wichita, Kan., metro area.

S1 E3 | The Mysterious Letters