1/2 AA line check

[acseif]

Villain is loose passive, and has been playing pretty ss until a recent double up. He checked down top two with two behind to act on the river after checks all around on all previous streets, which makes me question my line, henceforth the post.

Full Tilt Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 4 Players - (LegoPoker Hand History Converter)

SB: $270.90
Hero (BB): $203.60
UTG: $135.00
BTN: $226.55

Preflop: Hero is dealt A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] (4 Players)
<font color="red">UTG raises to $4.00</font>, BTN calls $4.00, SB calls $3.00, <font color="red">Hero raises to $18.00</font>, UTG folds, BTN calls $14.00, SB folds

Flop: ($44) 8[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $35.00</font>, BTN calls $35.00

Turn: ($114) J[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $85.00</font>, BTN calls $85.00

River: ($284) 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets all-in for $65.60</font>

Pot Size: $349.60