QUANTICO, Va. -- An Oakley Marine who joined the corps in December 2011 was one of two killed by a tactics instructor Thursday in a base barracks shooting, military officials said Saturday.

Lance Cpl. Sara Castromata, 19, of Oakley, was a warehouse clerk before she was shot to death by Sgt. Eusebio Lopez, 25, of Pacifica, investigators said. The shooter, who killed himself after the shooting, was a teacher at a school that tests Marines who want to become officers.

Lopez also killed Cpl. Jacob Wooley, 23, of Guntown, Miss., a field radio operator, on Thursday night inside barracks at the Marine Corps Base Quantico in northern Virginia. Other than to say the three Marines worked together at the school, military officials have not described their relationship or released a motive for the shooting.

Lopez was a teacher whose specialty was machine gunner. He joined the corps in May 2006 and deployed in support of the wars in Iraq and Afghanistan.

Lopez was an instructor at officer candidates school, known for its grueling 10-week program that evaluates Marines on physical stamina, intelligence and leadership. The candidates must complete obstacle courses, hikes of up to 12 miles in full combat gear and take classes on navigation and tactics that help them in the field, according to the school's website.

Lopez's great-grandfather, also Eusebio Lopez, said the Marines contacted the family Friday night.

"They told us they were investigating more, and they'd let us know. He wasn't the type to do stuff like that," said the elder Lopez, 81.



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