is this too weak with KK?

[fizzleboink]

I raise the turn. I think you're ahead the majority of the time and even if you aren't, you have a pretty solid draw to improve. I think if villain is beating you he would have either capped the flop and led, or check-raised the turn.

The way you played it, I bet the river. He's probably afraid of the Ace that hit and is afraid to bet his lower pair.