Virginia Tech police Officer Deriek Crouse was shot and killed on Thursday, Dec. 8, 2011, during a routine traffic stop on the school's Blacksburg, Va., campus. (AP Photo/Virginia Tech)
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Virginia Tech police Officer Deriek Crouse was shot and killed on Thursday, Dec. 8, 2011, during a routine traffic stop on the school's Blacksburg, Va., campus. (AP Photo/Virginia Tech)
