In my limited capacity as a holder of a BS in Criminal Justice and assuming that your question is not rhetorical. The answer is no, he pled guilty to that which he was charged with and I think a case would be made that it would be Double Jeopardy to charge him again. However in all matters the way I understand it, is that if new infromation/evidence came to light then they could persue a new indictment based on that information/evidence.
Well ok... it will just be a fantasy of mine then!
But wait a sec... he wasn't charged with murder, or even manslaughter, right? Just leaving the scene of an accident IIRC. ???