Do I raise this river?

[jazzcom]

Party 2-4 limit. Villain's stats are 19/9.7/2.6. Villain is BB

Hero is UTG and is dealt A [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/heart.gif[/img]

Preflop: Hero raises, folds to villain, villain calls.

Flop: A [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/spade.gif[/img]
Villain checks, hero bets, villain calls.

Turn: 9 [img]/images/graemlins/diamond.gif[/img]
Villain checks, hero bets, villain calls.

River: 8 [img]/images/graemlins/club.gif[/img]
Villain bets, hero?

thanks for listening.
-jazz