The Marine who allegedly gunned down two other Marines before killing himself last week was a tactics instructor at the Officer Candidate School in Quantico.

Military officials late Saturday identified Sgt. Eusebio Lopez, 25, as the Marine who shot and killed Lance Cpl. Sara Castromata, 19, and Cpl. Jacob Wooley, 23, on Thursday. Officials did not provide additional details about the connections between them or a motive for theshooting that occurred inside a barracks on the base that is located about 30 miles southwest of Washington.