I don't like talking about the shooter as it's not about him but it's about the victims but there is new information being reported. Apparently he set a fire in his dorm, stalked women on campus and wrote essays abot a terrible massacre that was going to happen. Some of his fellow students had talked about the possibility if he could be a shooter.
http://www.cnn.com/2007/US/04/17/cho.profile/index.html