[Cavok]

I can't see him putting you an anything else but Ax or a pp after raising preflop and calling all the way to the river, so why would he c/r you and hope to win with Ax himself?

He knows you will never fold a pp or an ace here so he has to be able to beat that to c/r you, and you will never call his raise with Kx so his raise is 0EV and he will just call behind with an ace.
Easy fold on the river for me.

I would've re-raised on the flop and checked behind on the river if I stayed in the hand that long.

Blurry enough or do you want me to mess it up a little bit more?