What makes a murderer choose one killing method over another? We spoke with experts to gain insight into murder weapon preferences and what they mean.

On July 20, 2012, 12 people were killed and dozens more injured at a midnight showing of Batman: The Dark Knight Rises, when James Holmes opened fire in an Colorado theater. We spoke with forensic psychiatrist Dr. William H. Reid, who did extensive interviews with Holmes, about the mass shooter's mental state.

People are trading bitcoin for goods and services on the illegal marketplaces of the dark web, where the easy, instant flow of the cyptocurrency allows users to tap into their darkest natures--all from the anonymous comfort of their home computers.

Debates around and other little-known facts about the leader of the Branch Davidians, David Koresh, and the Waco siege.

Dr. Peter Langman, Ph.D, one of the foremost experts in the psychology of school shooting perpetrators, talks to A&E True Crime about who commits these heinous crimes, why they do it and what we can do to prevent the next shooting.

Kristina Anderson, survivor of the Virginia Tech mass shooting, tells her story of that tragic day and how to prepare for an active-shooter scenario.

In the wake of the Las Vegas mass shooting, we asked Ken Holmes, a retired California coroner and former death investigator, how coroners prepare physically and emotionally for large disasters.

Some people aiming to make DIY guns have found resources on the Internet, including Cody Wilson's Defense Distributed, stirring up a hornet's nest of legal and ethical challenges.

Q&A with Nick Bilton on his book, "American Kingpin: The Epic Hunt for the Criminal Mastermind Behind the Silk Road," about Ross Ulbricht's extremely successful (and totally illegal) website.