Seven killed and 46 injured in Highland Park, Ill., on July 4, 2022He suffered from severe back pain.
Eight killed and seven injured in Indianapolis on April 15, 2021He was known for being paranoid with a short temper.
Five killed and seven injured in Aurora, Ill., on Feb. 15, 2019He had expressed violent thoughts.
Nine killed and seven injured in Red Lake, Minn., on March 21, 2005He had been noticeably depressed and angry at church.
Seven killed and seven injured in Fort Worth on Sept. 15, 1999He killed his daughter’s cat because he was upset.