An hour after a man fired shots indiscriminately in the Van Ness neighborhood on a busy Friday afternoon, Raymond Spencer updated the Wikipedia page for the nearby Edmund Burke School. “A gunman shot at the school on April 22, 2022,” Spencer wrote. “The suspect is still at large.” Police later identified Spencer from Fairfax, Va., as a person of interest in the shooting before announcing that a suspect was found dead that night in a nearby Van Ness apartment surrounded by firearms and ammunition. On Saturday, D.C. Police Chief Robert J. Contee III said the gunman fired more than 100...