 after a bullet grazed his ear, coming within millimeters of killing him. Officials say 20-year-old gunman Thomas Matthew Crooks lived near the rally in Butler, Pennsylvania. CBS's Meg Oliver. Crooks' political leanings are unclear. Records show he was registered as a Republican voter in Pennsylvania, but previously made a $15 donation to a Democratic-aligned group. He was shot dead by Secret Service snipers. Audrey Gibson Chiquino is coordinating Secret Service for the convention in Milwaukee.