Investigators speak for the first time on one of the most baffling cases they've encountered, exposing the devastating truth about what happened to Shanann Watts and her two daughters at the hands of a seemingly devoted husband and father, Chris Watts.

A crazed rideshare app driver goes on a seven-hour shooting spree, killing six people and critically injuring two. He claims the app took over his body and made him do it, while those suffering the loss of loved ones struggle to understand why.