Villain looks nitty,but we have one history in 3bet pot:

I squeezed preflop and he c/c on T92 3way ,turn was 4 and he lead allin.(little bit more than psb). He showed up 77.

Is it okay with this info?Should I check somewhere without Kh?

PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 231.6 BB (VPIP: 22.09, PFR: 16.28, 3Bet Preflop: 6.98, Hands: 90)
SB: 130.24 BB (VPIP: 19.59, PFR: 12.37, 3Bet Preflop: 0.00, Hands: 101)
Hero (BB): 103.04 BB
UTG: 100 BB (VPIP: 19.72, PFR: 14.08, 3Bet Preflop: 4.00, Hands: 75)
MP: 126.04 BB (VPIP: 22.13, PFR: 18.49, 3Bet Preflop: 6.45, Hands: 366)
CO: 117.1 BB (VPIP: 24.51, PFR: 16.83, 3Bet Preflop: 4.37, Hands: 624)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K K

fold, fold, CO raises to 2.5 BB, fold, SB calls 2 BB, Hero raises to 11 BB, fold, SB calls 8.5 BB

Flop: (24.5 BB, 2 players) Q 6 5
SB checks, Hero bets 15 BB, SB calls 15 BB

Turn: (54.5 BB, 2 players) T
SB checks, Hero bets 28 BB, SB raises to 104.24 BB and is all-in, Hero calls 49.04 BB and is all-in

This is a pretty gross spot.

I think we can fold here, the x/r by villain OTT suggests quite a bit of strength.

I will often snap this off hoping to see pair/heart draw, though more often than not villain shows up with set+

I think you might have to fold here. The villians line screams strength. I don't see any nitty players c/c-c/r with anything you beat.

it's fine although your sizings are a bit awkward, you would have had like 44% pot left on the river if he called turn and there are lots of bad river cards for you

probably just sizing for 2 streets here instead without Kh