Prepare to get a glimpse into the innerworkings of the mind of a serial killer.

A&E's new documentary, BTK: Confession of a Serial Killer premieres Jan. 8 and 9, and so far, it looks creepy AF. In an E! News exclusive clip, American serial killer, Dennis Rader, known as BTK, gives the details behind the murder of one of his victims, Nancy Fox, in a never-before-heard conversation with professor of Forensic Psychology, Dr. Katherine Ramsland.