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.

The French producer's murder in West Cork shocked the normally crime-free region of Ireland.

One expert says priests in Mexico are targeted because they work in direct opposition to the interests of organized crime.

The leader was sentenced to life behind bars in 2011.

Sue Black, a renowned forensic anthropologist, gives us insights into the stories bones tell.

Learn about the early years of one of America's most infamous serial killers, Gary Ridgway, who was convicted of murdering 49 people.

What did the killer do in the days before being executed for the murder of 168 people? What was his last meal, last words and last activities?

He was sentenced to death in 1989 for 13 murders, but escaped execution when he died of natural causes in 2013.

Albert DeSalvo, believed to be the serial killer responsible for the deaths of 13 women in the Boston area in the early '60s, told of a childhood marked by extreme violence and cruelty.

In the spring of 1999, the 22-year-old targeted London's Black, Bangladeshi and gay communities with homemade explosives. Where is he today?

Some of the most infamous criminals in history experienced murders first-hand before they starting doing the killing themselves.

Sydney Biddle Barrows, Rose Laws and more. Some women live dual lives as madams/escorts and everyday citizens.

We speak with experts about the various reasons why notorious murderers become targets themselves while behind bars.

We speak with author Sarah Berman on her book, 'Don't Call It a Cult: The Shocking Story of Keith Raniere and the Woman of NXIVM.'

We spoke to Zeman about the findings that made him, along with investigative journalist Maury Terry, question the official account that serial killer David Berkowitz acted on his own.

Twenty years after actor Robert Blake’s 2005 murder trial ended in acquittal, the shooting death of his wife remains officially unsolved.

In the panoply of American killers, Gary Ridgway stands out.

Letourneau's affair with her student stunned America in 1997.

The case of Hae Min Lee’s murder captivated the world.

Laci Peterson vanished in 2002—Scott was later convicted.

Broderick fired five shots at her ex-husband before fleeing.

David Berkowitz’s 1977 arrest ended a year of fear in NYC.

The 1969 Manson murders marked the dark side of the ’60s.

A fashion icon’s murder capped Cunanan’s killing spree.

Hernandez’s case raised questions far beyond football.

The Murdaugh murders exposed a web of deceit and financial crime.

Caylee Anthony’s disappearance shocked the nation in 2008.