April 2, 1955 - Mark O. Barton
Barton's rampage in the summer of 1999 unfolded in two phases — the killing of his wife and children at home, and then the targeted attack on the trading offices where he had suffered significant financial losses. The sequence and premeditation distinguish the case from more impulsive acts of mass violence, as do the notes he left behind explaining his reasoning. The July 29 shootings at Momentum Securities and All-Tech Investment Group remain the deadliest mass shooting in Georgia's history.
From Wikipedia
On July 29, 1999, a shooting spree occurred when 44-year-old Mark Barton fatally shot nine people and wounded 13 others. Barton's shooting spree is the deadliest mass shooting in Georgia's history. Barton fired a total of 39 rounds at two Atlanta-area day trading firms, Momentum Securities and the All-Tech Investment Group. He later committed suicide before he could be apprehended by police.
Police searching Barton's home in nearby Stockbridge found the bodies of his second wife and the two children from his first marriage, whom were fatally struck by hammer blows inflicted before the shooting spree started. According to a note left at the scene by Barton, his wife was killed on July 27, while the children were killed on the following day. Barton was believed to be motivated by large financial losses incurred during the previous two months.
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