D.C. police have arrested a third suspect in the Feb. 3 killing of Carlos Alexander. Alexander, 47, was found dead lying on a sidewalk early that morning in 700 block of 21st Street NE. Police had previously arrested Daquan Johnson, 19, and a 16-year-old male, both of D.C., for the crime, and now a third suspect, a 16-year-old male whose name has not been released, has also been arrested in the case. The third suspect was taken into custody on Saturday, police said. The D.C. Medical Examiner’s office ruled that Alexander’s death was a homicide, and that he died due to complications resulting from blunt force injuries.