A Portrait of the Killer

What triggered the rampage? A 1995 document may offer clues to the mystery of Mark Barton

The manager and his secretary thought they knew Mark Barton when he walked into the Atlanta office of All-Tech Investment Group last Thursday afternoon. They greeted the day trader by name, and he commiserated with them over the news lighting up every trader's terminal: the Dow's nearly 200-point slide. He seemed to be the old client they were familiar with. No one knew that Barton was packing two handguns; that on Tuesday he had murdered his wife, on Wednesday his son and daughter; that he had just been at the building across the street, at another brokerage, Momentum Securities, where he...

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