The Behavioral Analysis Unit was established in 1972 to consult experts on "different, unusual or bizarre cases." ...

Long Island’s most notorious serial killer will help the FBI figure out what makes his sick mind tick — part of his chilling ...

Gilgo Beach killer Rex Heuermann will be evaluated by the FBI's Behavioral Analysis Unit after admitting to the murders of ...

Heuermann admitted to being the violent serial killer who brutally murdered eight young women in a spree that likely began in ...

'Today' co-anchor Savannah Guthrie's mother, 84, is still missing with no named suspects after her Tucson, Ariz., abduction.

A researcher and psychiatric clinical nurse specialist who worked closely with the FBI believes the motive behind the ...

What drives a serial killer — and how did Rex Heuermann go undetected for so long? After pleading guilty to multiple murders ...

OK. We're now joined by former FBI agent and FBI profiler Mary Ellen O'Toole. She worked in the agency's Behavior (ph) Analysis Unit for more than a decade and is now the director of the forensic ...