Hero (SB): $591 (98.5 bb)
BB: $898.35 (149.7 bb)
UTG: $643.50 (107.3 bb)
MP: $584.95 (97.5 bb)
CO: $642 (107 bb)
BTN: $522.15 (87 bb)

Preflop: Hero is SB with Jh Ks
4 folds, Hero raises to $18, BB raises to $54, Hero calls $36

Villain is unknown but appears to be a reg with the little amount of stats I have on him. This is the worst KXo I call in this spot.

Flop: ($108) Js 9s 8s (2 players)
Hero checks, BB bets $66, Hero calls $66

Turn: ($240) Jd (2 players)
Hero bets $138, BB calls $138

My lead is far from standard but I feel it's a decent hand to do it with since I think this turn is getting checked back a lot. By donking, I get more value from his overpairs/AsX type hands that would otherwise check through. I can balance my range here by betting my 99/88 for nutty value and bluffs like KsQx, KxQs type hands.

River: ($516) 7s (2 players)
Hero checks, BB bets $516, Hero folds

I think most of his range should be overpairs, Jx, the occasional boat, and AsX on the river. I expect his overpairs to check through most of the time and I don't think he has many natural bluffs at all so check/fold seems best. However, I'm a bit worried that this line leaves me exposed to overfolding the river since I can't think of having much of a check/calling range on the river after this line.