Rex Heuerman, the Long Island serial killer, has pleaded guilty to eight murders and agreed to sit down with the FBI Behavioral Analysis Unit.

Fox News Digital reporter Mike Ruiz explains the "rootless hair" DNA evidence that cornered Heuermann and details his upcoming sentencing.

Then, renowned forensic psychologist Dr. Kris Mohandie examines the "mask of normalcy" serial killers wear and what the FBI BAU hopes to extract from one of the most prolific predators in New York history.

Watch Crime & Justice on Spotify. Spotify Premium users get no commercial breaks!

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