Over 20 years later, Dr. Stuart Hart, a child psychologist and expert defense witness in the trials of Erik and Lyle Menendez for the 1989 shotgun murder of their parents, still believes the brothers were abused.

Live PD host and veteran legal commentator Dan Abrams on some of the high-profile cases he's covered.

A&E True Crime spoke to experts to explore the disturbing reasons why some men kill the person with whom they've vowed to share a lifetime.

Forensics has revolutionized law enforcement in the last several decades. We talk to the experts to see how these advancements have helped to close tough cases.

We ask retired CSI detective Ken Martin about the legitimacy of TV cops digging bullets out of walls, tying red strings through a scene, and other forensic techniques to learn which are real and which are just for the camera.

Women have been murdering their children since the beginning of time. But what would drive someone to end a life they brought into the world?

Isabel Martinez recently shocked the world by allegedly stabbing to death her husband and four of her five children (she's been charged with multiple accounts of murder and aggregated assault). Although she has yet to be convicted of any crime, we are reminded of famous cases of mothers convicted of killing their children.

On July 15, 1997, fashion designer Gianni Versace was shot and killed. His alleged murderer's killings have been described in the press and by some criminologists as a "spree," while the FBI classifies him as a serial killer. So what's the difference?

For the many male serial killers you can no doubt name off the top of your head—Jeffrey Dahmer, John Wayne Gacy, Ted Bundy, Jack the Ripper—there are likely far fewer females of the genre that come to mind. Meet four female murders whose stories you won't forget.

An excerpt from David Schmid's article, "Why Americans Are So Fascinated by Serial Killers," on HISTORY.com.