Micro 6 Max: AKo

[Duerig]

Villain in this hand is short stacked. After the flop action, I put him on 2 pair or a set. The check behind on the turn means either...

- He capped the flop w/67 ?
- He has 2 pair or a set and wants me to bet the river

My main question here is what I should do on the river, but comments on all streets are appreciated.

Party Poker 0.50/1 Hold'em (6 max, 5 handed) converter

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG calls, MP calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, BB calls, UTG calls, MP calls.

Flop: (8 SB) 5[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG folds, <font color="#CC3333">MP raises</font>, <font color="#CC3333">Hero 3-bets</font>, BB folds, <font color="#CC3333">MP caps</font>, Hero calls.

Turn: (8.50 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP checks.

River: (8.50 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

Hero??