[yourface]

to me his turn check looks like a weak draw. I doubt that he would risk giving a free card with a made hand on such a draw heavy board. so the river either gave him a pair of jacks or a straight. bayes says that a straight is more likely, so I think that the river is a check

even if he checked a weak pair to you on the turn, could he make the river call on such a ridiculous scare card?