The villian could be raising the turn with almost anything. Any pair, including baby pockets, could be raised here.

I think that his range on the river that warrants a call is very limited. I don't think that many people will be betting this river with KQ or AQ after they raised the turn. If they had KQ or AQ they probably raised the turn figuring that they had put their last bet into this pot.

I still think that it is a tough fold though.