[Aaron_]

I don't think the river bet is very valuable. You've represented a king or pocket pair the whole way - what's he calling you with that he doesn't have you beaten with? I'm so afraid of a check-raise on a board like this that I'm checking behind him and seeing a showdown for free.

Edit: Also wanted to add that if you've been folding to turn/river bets a lot after controlling the hand, it might be worth it to call his reraise getting 9:1. I've seen a lot of seemingly passive/weak players wake up and get creative in situations like these, and the pot may be big enough.