xfinity xfi, simple, easy, awesome. >> reporter: it was two nights after the murder and fire. detective capps made a discovery one that would finally connect the dots in the series of crimes that had terrorized this college town. >> i spent that evening basically reading through all these reports. >> reporter: the detective had ordered background checks on some of the people who attended the party in carolyn's apartment complex, including ynobe matthews. it turns out, there were several police reports in the file accusing ynobe of a number or crimes. >> mr. matthews had a tendency to try to sexually assault females, and in the process of