The idea that people have a right to defend themselves—even using force that would otherwise be illegal—harks back centuries and formed the basis of the American legal system. We navigate the murky and still-evolving world of self-defense laws in the U.S.

We speak with Christopher Kuvlesky, an agent with the Investigative Services Branch (ISB) of the National Park System about what it's like investigating violent crimes within our vast national parks.

Snakes, rats, dogs and pigs—some killers weaponize animals to pull off their heinous crimes.

One in nine men experience severe physical violence at the hands of intimate partners. And when they do, their survival is uniquely challenging.

Producers Malcolm and Xander Brinkworth speak with A&E True Crime about what makes their show so unique.

Veggie pizza, canned spaghetti and ice cream are among the last-meal requests from infamous killers. We talk to Ashley Lecker, author of a new book of recipes of some of these final meals, 'The Serial Killer Cookbook.'

California serial killer Michael Gargiulo was convicted of murdering two women and attempting to murder a third. What was his life like before he turned to killing and how did he find his victims?

Research shows that properties with uncomfortable histories lose value—even when they've sustained no physical damage. Of course, not all stigmas are worth the same financial downgrade: A house with a reported murder will likely take more of a price hit than one with a reported haunting. Read more on murder houses.

Some murders may never have happened if two people didn't share the same homicidal delusions. Read infamous cases of folie a deux.

Because of the lack of statutes acknowledging Munchausen by proxy—and the general confusion about what this abuse looks like—law enforcement and courts often struggle with how to prosecute this type of medical child abuse, say experts.