On Thursday night, July 24, Xinran Ji was walking home from his study group meeting, four blocks from USC, where he was a graduate student in engineering. According to police, four teenagers, three boys and a girl, beat 24-year-old Ji with a baseball bat and a wrench. No reason. No connection. Ji managed to struggle back to his apartment, where his roommate found him the next morning, dead in a pool of blood that police traced back to the spot where he was attacked.