A Tiger, a LAG and a fish walk into a bar

[Scary_Tiger]

UTG is 52/25/2.82 over 180 hands five handed. I've only been at table with MP this orbit, but he's already shown his retardedness last hand. He open limps in CO, I raise AQo, flop AQ4fd, he c/c, turn 8f he c/c, river Jf, I check behind, his 86s not even a backdoor flush draw is no good.

PokerStars 10/20 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is CO with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises</font>, MP calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">UTG caps</font>, MP calls, Hero calls.

Flop: (13.50 SB) Q[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets</font>, MP calls, Hero calls.

Turn: (8.25 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, MP checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, MP calls, Hero calls.

River: (14.25 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, MP checks, <font color="#CC3333">Hero ???</font>

3-bet turn? Bet/call river? Bet/fold river? Check behind?