David Odisho/Getty Images(SACRAMENTO, Calif.) -- A second suspect has been arrested in connection with a shooting that killed six people in a popular nightlife area in Sacramento, California, Sunday. Smiley Martin, 27, was taken into custody Tuesday, Sacramento police said in a statement. Martin has been receiving medical treatment for "serious injuries" from gunfire and is under police supervision in a hospital, police said. He will be booked once his care is complete and is being charged with possession of a firearm by a prohibited person and possession of a machine gun. Smiley Mar...