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

Rex Heuermann agreed to talk to behavioral analysts at the F.B.I. when he pleaded guilty. The unit has interviewed Ted Bundy, ...

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 ...

Using research conducted by the FBI’s Behavioral Analysis Unit (BAU) and other sources, Part 1 of this three-part series discussed common deception strategies school shooters have used to evade ...