Tricky situation with slick in SB

[HEIFER]

Party Poker (6 handed) converter

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font> CO limps hero raises BB calls CO calls

Flop: 9[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero bets, BB folds, Villian raised, hero 3, bets villian calls

Turn: Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
hero bets, villian raises, hero calls

River: K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks. villian bets hero?