Matthews had a few lucid moments a while back but the old urges have returned with a vengeance and now he's back splashing around in the shallow end of the pool.
Matthews displays several of the 13 chatacteristics of Down Syndrome, and his face looks like a partially developed fetus. I'm pretty sure that the end of his brain stem looks like a lollipop, with a tiny ball of semi-developed brain hovering in the relatively massive cavity of his largely empty head.
His ability to process information and respond like a rational adult is severely impaired. If [when?] he kills somebody, the jury will likely find him unfit to stand trial by reason of arrested development. He acts and talks like a six-year-old, and while this is an over-simplification, so is he.
8^D