Correct river decision after villian check behind...

[BrassMonkey]

Villian appears to be pretty darn aggressive, at least pre-flop. What should I do here? Check/call, bet/fold, or bet/call? I seem to really suck at these river decisions.

PokerStars 3/6 Hold'em (6 handed) internettexasholdem.com

Preflop: Hero is UTG with A[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#CC3333">MP 3-bets</font>, <font color="#666666">4 folds</font>, Hero calls.

Flop: (7.33 SB) T[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">MP 3-bets</font>, Hero calls.

Turn: (6.66 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP checks.

River: (6.66 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero ?</font>