Lou Chibbaro, Jr. writes in the DC Agenda that a recent homicide marks the second gay man who was killed in the District in a span of only two weeks. Gordon Rivers, 47, was found on Jan. 10 in the 2600 block of Naylor Road SE, suffering from multiple gunshot wounds, and later died of his injuries. Anthony Perkins, 29, was shot to death on Dec. 27 in the 1800 block of T Street SE….