April 9, 2013 8:46 am Motive in Apparent Murder-Suicide Remains Elusive Detectives believe U.S. Army Staff Sgt. Adam Anthony Arndt, 31, shot a high school senior before turning the gun on himself. Local 2:37 Police find 10 card skimmers in Prince George's County in less than a month 1:57 Man shot, killed near Potomac Ave Metro station in Capitol Hill 26:02 GOP House members visit pro-Palestinian encampment at GW: The News4 Rundown 2:02 Man on trial for murder claims he shot construction workers in self-defense 4:28 After-action report describes flaws with District Dogs flood response