(Covers information from the D.C. comics)
Mike was somewhat concerned with his safety at the university after a classmate, Julie was killed on the campus grounds, but made light of it by inviting Raquel and Michelle Allen over to his dormitory for the night so he could protect them. Later that night, Michelle was killed by the assailant after refusing to listen to suggestions that she follow the curfew.
Michelle's death had a significant impact on Mike after that. When Jill Valentine investigated the university, posing as a transfer student from Grant, he warned her to transfer back if she can't handle curfew hours, and especially stay away from the library where Michelle was killed.