50nl river push

[BG1124]

This hand really stands out from my last session and was looking for some opinions on the river. No reads on villain and was looking to get some value but then he pushed... whats my play here?

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

Hero (BTN): $80.30
SB: $21.10
BB: $50
UTG: $15.65
CO: $48.75

Pre-Flop: Q[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
UTG folds, CO calls $0.50, Hero calls $0.50, SB calls $0.25, BB checks

Flop: ($2) K[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/spade.gif[/img] (4 Players)
SB checks, BB checks, CO checks, <font color="red">Hero bets $2</font>, 2 folds, CO calls $2

Turn: ($6) 3[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">CO bets $2</font>, Hero calls $2

River: ($10) J[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">CO bets $3</font>, <font color="red">Hero raises to $11</font>, <font color="red">CO raises to $44.25 and is All-In</font>, Hero...