This. I'm sure in my heart that the Liberty University incident was indeed a rape or at least a violent sexual assault, and that the victim was pressured to not pursue the matter, and that the police investigating the matter gave it short shrift. One article says "Lynchburg police officers say they interviewed both the victim and Matthew and decided there wasn't sufficient evidence to move forward, in light of the victim wanting to pursue charges." Another stated she went to the ER after the "incident" and had initially contacted the police to press charges. The police then say the victim didn't return their subsequent calls so they dropped the matter.
If the matter had been handled better, they would have had his DNA, and tracked him down after the 2005 Fairfax attack, and he would have been rotting in a prison rather than being free to attack and kill Morgan and Hannah.