 Clearly see him, cops did nothing. The gunman, 20-year-old Thomas Crooks, then opened fire. He then was killed by a Secret Service sharpshooter. What do we know about Crooks? People who knew him in high school say he was a loner, an easy target for bullies. I mean, he would sit alone at lunch. I mean, he was just an outcast, and you know how kids are nowadays. I want to say he was a loner more because he was just, he was quiet. Meg Oliver has more on the killer. Take a look at what happened over there.