Villain is 21/2 over 250 hands, folds to flop 60% and turn 70%.

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Converter Tool from (Format: FlopTurnRiver)

SB ($84.80)
BB ($73.40)
UTG ($59)
Hero ($146.55)
Button ($102)

Preflop: Hero is MP with K, A.
1 fold, Hero raises to $4, Button calls $4, 1 fold, BB calls $3.

Flop: ($12.50) 4, 8, K (3 players)
BB checks, Hero bets $8.5, Button folds, BB calls $8.50.

Turn: ($29.50) 2 (2 players)
BB checks, Hero bets $18, BB calls $18.

River: ($65.50) 3 (2 players)
BB bets $42.9 (All-In), Hero folds.

Final Pot: $65.50

looks good to me given his stats...

Oh yeah if you could also tell me what you guys do against an unknown as well that'd be super.

eh...even against an unknown i think this is a fold if shoves into me on the river.

its like...come on. comeon.

Eh I know checking the turn here is the BTP standard but I think it''s pretty bad TBH, you gotta stack them [Js] and [Ts].

EDIT: If he had $30 more (so if he were full stacked) then I think checking behind the turn is fine.

i like the turn bet. good size to induce bluff-shoves, too.

river is a fairly easy fold.