On July 29, 1999 Mark Barton, a day trader known as “The Rocket”, walked into his former office in Atlanta. He was smiling - until he pulled out two guns and opened fire on his colleagues. By the end of the day 12 people would be dead and 13 wounded in a bloodbath that shocked the nation. What caused the family man and Cub Scout leader to snap and kill not just his former colleagues, but his entire family?

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