I agree that some form of mental health problem is possible, as it could explain why the accused is not known locally as he possibly spends time elsewhere, attended a different school etc. And if the photoman is the accused, it could explain why he was at the scene the next day, as this was a serious error of judgement that most attackers would not place themselves so close to the murder scene the following day. I wonder did JJ approach the accused due to her experience dealing with difficult people in work but received a violent reaction. On the other hand if he had a learning disability or similar, I would assume he would come clean when asked and would crack easily during interrogation. Although this is MOO, I hope for an update today with more information.