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Dec. 8, 2011: This undated photo shows Virginia Tech Police Officer Deriek W. Crouse, 39, of Christiansburg who was killed by a gunman on Virginia Tech campus. (www.vt.edu)
Dec. 8, 2011: A police officer secures the scene where a gunman killed a police officer and another person after a traffic stop on the campus of Virginia Tech, in Blacksburg, Va. (AP/The Roanoke Times)
Dec. 8: Authorities respond to reports of shots fired in the parking lot of Virginia Tech's Cassell Coliseum. (WDBJ-TV)
Dec. 8, 2011: A police officer secures the scene where a gunman killed a police officer and another person after a traffic stop on the campus of Virginia Tech, in Blacksburg, Va. (AP/The Roanoke Times)
Dec. 8, 2011: In this image taken on a cell phone, authorities gather outside Torgersen Hall on the Virginia Tech campus in Blacksburg, Va. (AP/The Roanoke Times)
Dec. 8, 2011: Virginia Tech police officers console one another as they move toward the scene where a fellow police officer was killed in a parking lot on the campus of Virginia Tech. (AP)
Dec. 8, 2011: Students look on as police investigate the shooting death of a Virginia Tech police officer in a parking lot on the school's campus. (AP/The Roanoke Times)
Dec. 8, 2011: Local S.W.A.T. team members congregate near a parking lot on the campus of Virginia Tech to look for an armed man who is suspected of killing two people. (AP)
Dec. 8, 2011: SWAT team members leave the campus after police searched for an armed man suspected of killing a Virginia Tech police officer making a routine traffic stop, on the campus of Virginia Tech. (AP)