this woman was concerned that an ex-boyfriend of hers may have been involved in olamide's disappearance. >> the man was 27-year-old maurice wallace. he lived in the building about 100 yards from olamide's apartment. though not a college student, wallace had been living on or near campus for years. many students remembered him, and not fondly. >> he would invite himself to parties. people described him as kind of creepy and strange, women especially. >> he wasn't a student. he wasn't a member of the community. he was a bad person. he was a bad person. and myself and 25,000 other 20-somethings in normal will attest to that. >> a background check revealed maurice wallace had served four months in jail shortly before olamide's murder. >> maurice wallace had assaulted and battered someone in a taxicab. it was a situation where he didn't know the victim prior to the assault, and it was another example of his unpredictability and aggressiveness. >> after he was released, wallace had trouble finding work, and he told a former