Interestingly, the lead investigator of the time, Lewis C. Rigler, finally believed that Virginia ran away to start a new life for herself. I'm not sure how he arrived at that conclusion, as there was no evidence for it and every reason to suspect foul play. Perhaps it was just his way of dealing with the fact they never found out what happened to her. Anyway, I agree with you. The taxi driver was the last confirmed witness to see Virginia, he was later accused of sexually assaulting another young woman, and apparently he was known to abuse his wife and kids. Not to mention his decision to leave Virginia's trunk on the lawn instead of delivering it to her dorm is very suspicious.