You may have heard about body farms, the research facilities where people donate dead bodies for scholarly research. But have you ever wondered what goes on in these places? What exactly are scientists doing with all these donated bodies? What mysteries are they trying to solve, and why?

Ken Holmes, a retired death investigator and coroner, talks to A&E True Crime about the small clues that have helped solve big crimes and the surprising aspects of dealing with death for a living

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.