[sy_or_bust]

You need to interpret his turn check. Specifically, was it designed to induce a bluff? It sure looks like LAG made the aces and worries that you've got nothing and won't tag along. When you bet the river, he may occasionally raise a bluff, but I think you're behind very often to this raise. When you check, though, you should induce a bet 100% of the time which you can safely call.