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Catching Killers:

How DNA Helped Catch a Killer, 31 Years Later

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»DNA Profiling

How DNA Helped Catch a Killer, 31 Years Later

Short | 03:05

To prove that Dennis Rader is BTK - and not the "normal guy" he seems to be - the police have to get creative with DNA testing.

More About This episode

Used to nab a serial rapist terrorizing a small English town and to identify one of America's most notorious murderers (the ruthless BTK Killer), DNA profiling has redefined forensic investigation. As science evolves, the ability of genetic profiling to help solve homicides continues to grow. Witness two landmark cases in the history of genetic profiling as scientists and detectives involved in ground breaking cases usher in a new age of forensic science.

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