loughner case. loughner, as you well know, is the suspect in that terrible shooting in tucson. and as you well know, killed in that attack was a federal judge, john roll. he was shot in the back, and he died at the scene. what this means is they'll have to find a judge from outside the state of arizona to hear jared loughner's case. of course, we'll keep you posted when they name that judge. the judge who will eventually hear the case against jared loughner. experts say loughner's odd behavior clearly suggests mental illness. so how were so many warning signals missed? cnn's drew griffin investigates. >> fourth year. >> reporter: on the very first day of class math teacher ben mcgahee knew there was something wrong with the student in classroom 209. a student named jared loughner, who would first become a disturbance. sudden outbursts, challenging his teaching. then going silent and ignoring everyone while listening to his ipod. the behavior the professor thought was threatening.