Grunch:

I can't imagine not 3-betting this river. The only thing that can beat you is KJ. If he has that, he really butchered it.

If I had KJ in villian's position I would have capped the flop and raised the turn. He was last to act on the turn behind a bettor and a caller. The only rationale he could have for not raising, albeit poor, was that he was afraid of a heart.