Why aren't you betting the turn? There's no reason to not be betting there unless you hate money.
River bet sizing is a little large for the range of hands we want to call. As played, fold the river. I just can't see someone at 10NL bluffing
here, or someone tight / passive jamming the river w/ 2 pair or sets. He's just c/cing 98.59% of the time, or betting himself. AA mayyybe, but that hand doesn't make much sense based on how he played it. It sucks, but nothing else but KQ makes sense unless he's bluffing a busted spade draw, and it's unlikely that's happening imho.