Former FBI profiler Mark Safarik on which murderer he would interview: The crimes are ‘so heinous’

A&E's "Invisible Monsters: Serial Killers in America" features new interviews with survivors, investigators, forensic psychologists, prosecutors, as well as the victims’ family members.

Safarik’s decadeslong career in law enforcement has led him to serve as a consultant to crime shows, such as "Bones" and "The Blacklist," The New York Times reported. His studies on the behaviors of serial killers have been published in international journals, and he famously sat down with Long Island serial killer Joel Rifkin for a televised interview. Safarik spoke to Fox News about which killer he would interview today, why serial killers tend to be at their most active by a certain age, and whether there are still unknown victims out there.