[Raven]

I would bet again on the turn as he could really just have a middle pocket pair too and he will release it most of the time with the Ace.

In this hand he dont look like he is very strong with his small turn bet, but he could be the kind of player who bet small with a big hand, I just dont see it very often.

I lead on the river for something like 50 $ and I think you will be look upon some of the time, especially because the diamond draw did not make it. Since he is passive, I dont think he will try a bluff enough of the time in this dangerous looking board to compensate for the time he will check back a hand he would have called a bet with.