 Well, we've started to get a picture of who he is, but it's certainly not a complete picture. He worked at a nursing home in Bethel Park, Pennsylvania, where he lived. The administrator of that facility said that Crooks had passed a background check before he was hired. She also said it was a shock to hear that he was involved, allegedly involved in the shooting. Crooks was, as you said, he was just 20 years old. He graduated from high school a couple of years ago. Former classmates have spoken to the media. They said that he was quiet, a bit of a loner.