Few hands on vilain, he is 29/21/3B9% on 400 hands. Seems a good reg on the limit.

Hand converted by PokerTracker 4: http://www.pokertracker.com

SB: 202.77 BB (VPIP: 26.02, PFR: 19.54, 3Bet Preflop: 7.84, Hands: 1,114)
Hero (BB): 100 BB
CO: 100 BB (VPIP: 28.65, PFR: 21.22, 3Bet Preflop: 9.34, Hands: 394)
BTN: 74 BB (VPIP: 41.83, PFR: 27.19, 3Bet Preflop: 7.21, Hands: 546)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Kc Ks
CO raises to 2.5 BB, fold, fold, Hero raises to 9 BB, CO calls 6.5 BB

Flop : (18.5 BB, 2 players) 2c Td Qs
Hero bets 12 BB, CO calls 12 BB

Turn : (42.5 BB, 2 players) Th
Hero bets 25 BB, CO calls 25 BB

River : (92.5 BB, 2 players) 9c
Hero checks, CO bets 54 BB and is all-in, fold

CO wins 144 BB

Is it ok to check fold river as played ?
Would you check on the turn since the card improves his range more than our range ?
Thanks.