A 25-year-old worker put on probation at Modine Manufacturing Corp. in Missouri brings a .40-caliber handgun to work on July 2 and proceeds to kill three people and injure five others before taking his own life.
Six days later, a 48-year-old Lockheed Martin employee, thought to be a ticking time bomb by coworkers, storms out of a sensitivity training class, grabs a shotgun and semiautomatic from his pickup, and begins a rampage that leaves five dead and nine wounded before he fatally shoots himself in the chest.