Do I need to fold this river.

[ISF]

Villan is a bit loose preflop, but actually seems pretty good post flop. I.e can fold shows agression at right time etc.
I ended up calling, but in retrospect think it was probably a pretty -ev call vs a decent opponent. I would have felt fine about calling a turn raise as my gay bet looks pretty fishy, but I doubt this river raise is a hand I beat. Thoughts?
Party Poker 10/20 Hold'em (6 max, 6 handed) converter

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#666666">1 fold</font>, Hero calls.

Flop: (4.50 SB) 5[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Turn: (3.25 BB) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (5.25 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero calls.

Final Pot: 9.25 BB