Saint Valentine dies a martyr, President Polk has his picture snapped, Al Capone sends his foes a violent Valentine's Day message, and Jackie Kennedy invites TV viewers inside the White House, all on this day.
2008: Former Northern Illinois University student Steven Kazmierczak opens fire in a lecture hall of the DeKalb, Illinois, school, killing five people and injuring 21 more before committing suicide.
U.S. Air Force
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