.5/1 top two on 4th st, river questionable?

[mappedout]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 7 Players - (LegoPoker Hand History Converter)

Hero (SB): $76.05
BB: $76.40
UTG: $83.45
UTG+1: $30.90
MP: $130.60
CO: $90.55
BTN: $98.50

Reads: <font color="blue">Villain is unknown, this occured during his second orbit at the table.</font>

Preflop: Hero is dealt J[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] (7 Players)
3 folds, <font color="red">CO raises to $2.00</font>, BTN folds, Hero calls $1.50, BB calls $1.00

Flop: ($6) 3[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] (3 Players)
<font color="red">Hero bets $3.00</font>, BB folds, CO calls $3.00

Turn: ($12) J[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $6.00</font>, <font color="red">CO raises to $12.00</font>, <font color="red">Hero raises to $28.00</font>, CO calls $16.00

River: ($68) Q[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets all-in for $57.55</font>, Hero ?

For the flamers I did play this somewhat passively on the flop but i was OOP against this unknown so wasnt to sure where i was at till the turn came... at that point i thought i needed to extract some value from AK/AQ type hands by leading for 6... but what are you guys doing with this river? Do you lead this? If you do ck how often is his AI gonna be air? Very little i would think. How many people can fold this for another ~$45?

I'll post results after a few opinions. Thx