Police on Tuesday morning identified a 23-year-old South Korean-born student from Fairfax County as the man who killed and wounded dozens of Virginia Tech students and faculty in the bloodiest shooting rampage on an American college campus.

Official reports on Tuesday painted Cho Seung-Hui, an English major and Westfield High School graduate, as a troubled loner who alarmed professors and classmates through violent writing and strange, anti-social behavior.