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Stream the full National Geographic The BTK Killer movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

In one of the most significant CSI developments of the 20th Century, British investigators caught and convicted a murderer using DNA screening for the first time. Colin Pitchfork raped and murdered 15-year old Leicestershire schoolgirls Lynda Mann in 1983 and Dawn Ashworth in 1986. Find out how similar DNA techniques helped close a notorious Kansas cold case 20 years later, as the sadistic �Bind, Torture, Kill� murderer Dennis Rader was finally brought to justice.