>> we need light news today. first, virginia tech's campus plunged into panic when a gunman reopened the wounds from the april, 2007, massacre. >> we're looking for answers about what triggered this shooting. mark kelly joins us live from the campus in blacksburg with the very latest on this incident. good morning to you, mark. >> reporter: good morning, rob. we found out here the slain police officer has been identified. derek crousse, a u.s. army veteran, and the second victim -- the shooter. police believe he turned the gun on himself. [ siren ] >> reporter: it was chillingly familiar. the virginia tech campus on lockdown as police hunted for a gunman. shortly after noon, a campus police officer pulled over a vehicle in the coliseum parking lot. >> during that traffic stop the officer was shot and killed. and there were witnesses to that incident. >> reporter: juliet fielding was one of them. >> they opened his car door. when they opened it. he just fell out toward the ground. sorry. and -- i could see his face.