Id just jam the turn, I think. odds are hes a weaker player since you dont know him and Ive seen randoms play plenty of hands worse than KK this way here.

He could be leading with worse overpairs (TT, JJ), and when you flat, then assuming he's good, you have AK and just looking to take you to v-town. His bet sizing is super strong, so I don't think he's ever bluffing here. He could also have a hand like 9Tcc, or something similiar, where he's got a piece and a gutshot, which improves, and now he's going with it. Vs all the hands I can give him, I don't like your equity at all.

I'd be folding the turn too, I'm quite a nit with one pair hands (yes, we only have one pair!), although I hardly ever play full ring, so take what I say with a pinch of salt. 

you have one pair.   

The river was going to be 60 ish to call. 

I'd be folding in the absence of good info/history that he can fire 2 streets with a worse hand. 

Make it 12 pre-flop.
Call on the flop is the only option.

Can someone run it through pokerstove? You lose to 66/88/99/89 and you beat TT/JJ/9x/7x/T9/P+FD/random bluffs.

I would probably shove the turn. I play 100NL as well (6max) and I see too many people spazz around with random hands here.

Also, as an after thought, he doesn't need to check raise the flop, as he'd be getting his stack in anyways.

I would call turn and river, since I think donkbetting this flop with a set doesn't make too much sense. Not for a regular, since overpairs are probably going to cbet and the only thing u accomplish with a bet is letting air fold, so betteri to c/c, so I would say he is more likely to bet, and not for a fish, since they like to slowplay their nuts, and he can easily have a worse valuehand (overpair, 9x), that doesn't really want to face hard spots OOP.