William Calley, the army officer who was the only person to be convicted in relation to the mass murder of Vietnamese civilians, including children, in what came to be known as the My Lai massacre, has died at the age of 80. The Washington Post on Monday first reported Calley's death, which happened in April, according to a death certificate the newspaper cited. The New York Times, citing Social Security Administration death records, also reported Calley's death. Neither paper reported a cause of death. Calls to numbers listed for Calley's son, William L. Calley III, were not returned. William Calley,...