John McCarthy Roll (8 February 1947 - 8 January 2011) was an American judge who shot dead in the 2011 Tucson shooting. Roll had stopped at an Arizona shopping center to meet Democrat Congresswoman Gabrielle Giffords who was holding an informal meeting. A gunman attempted to assassinate Giffords, and Roll and four other people were killed. Another 12 people were wounded, Gifford surviving being shot in the head.