D.C. police have arrested a second man allegedly involved in the murder of Spingarn High School student Joseph Sharps on November 8 in Trinidad. Larnell Allen, a 19-year-old, was taken into custody on Friday and charged with first-degree murder while armed. Police believe that Allen — along with Kwan Kearney, who was arrested last Tuesday — killed Sharps as he was walking with a friend on the 1300 block of Holbrook Street NE. No concrete motive for the shooting has been established.