 The shooter, 20-year-old Thomas Crooks. What do we know about him? People who knew him in high school say he was a loner, 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. More on Crooks from Meg Oliver. Take a look at what happened. Sources say the firearm the 20-year-old used in the assassination attempt was legally purchased by and registered to the shooter's father. Mom!