Criminologist Dr. Scott Bonn deconstructs Dennis Rader's 'Factor X', the blamed culprit for why a devout Lutheran and father was driven to commit 10 murders between 1974 to 1991.

Timothy Krajcir, a serial killer responsible for nine murders, stumped investigators for nearly 25 years while killing multiple women in Missouri, Illinois and Pennsylvania.

How widespread is organ trafficking? According to Monir Moniruzzaman, a professor of anthropology at Michigan State University and an expert in illegal organ trafficking, it's happening in almost every country, all over the world.

We speak with Jane Blasio about how she learned she was one of about 200 newborn babies illegally sold through a clinic in McCaysville, Georgia in the 1960s.

Forensic anthropologists not only study bones, they also examine human remains and analyze crime scenes to reconstruct past events. We speak with one, Dr. Dennis Dirkmaat, to learn more about the field.

The Salt Lake City mother-to-be was murdered by her husband, Mark Hacking, in 2004 after she discovered he was lying about getting into medical school. We explore the case.

Dr. Richard Lettieri, a forensic neuropsychologist and psychoanalyst who's assessed hundreds of murderers throughout his career, talks to us about his most memorable cases and his book, 'Decoding Madness.'

We speak with author Mikita Brottman on her book 'Couple Found Slain: After a Family Murder' about the Brian Bechtold case and the grim daily reality of patients in forensic psychiatric hospitals.

Last words are part of a long practice in the United States, allowing the condemned a final opportunity to express themselves or ask for forgiveness.

Throughout the years, some murderers have turned to the popular classifieds advertisements website to find their victims. Here's why.