The killer, Mark Barton by John deHaan of Canada, August 1, 1999
On July 29, 1999, Mark Barton killed his wife, children and a number of other people in Atlanta, Georgia. He struck out at personnel at a stock day-trading firm. When surrounded by police, he committed suicide. Notice how the year and day-month terms share a common letter with Barton (the tet in Barton).