While violent crime in D.C. has dropped, incidences of domestic violence have not, according to U.S. Attorney for the District Jeanine Pirro. She said she’s working to change that. “There’s a lot yet to do in the District,” she told reporters at a news conference Wednesday. Pirro was asked about a recent shooting, in which 44-year-old Shawn Dewayne Williams, of Southeast D.C., was identified as a suspect in the killing of 44-year-old Melissa Wal…