An overpair question

Party Poker S&G 3-table 5/1

Villain seems quite the LAG after ~20 hands ( 50/9 ) - recent hand he went to showdown with A /images/graemlins/heart.gif 2 /images/graemlins/club.gif on a board of
A /images/graemlins/club.gif J /images/graemlins/club.gif 5 /images/graemlins/spade.gif 4 /images/graemlins/spade.gif 4 /images/graemlins/heart.gif

I'm CO with a stack of 955 - blinds are 10/20 and we're 8-handed. Button folds - i limp with 10 /images/graemlins/diamond.gif , 10 /images/graemlins/heart.gif looking for a trap. Fold, fold to Villain who raises to 40. All fold to the BB who calls. Flop comes 2 /images/graemlins/heart.gif 4 /images/graemlins/club.gif 4 /images/graemlins/spade.gif

Hero bets 100, Villain calls, BB folds.
Turn is 7 /images/graemlins/heart.gif
Hero bets 150, Villain calls.
River is 6 /images/graemlins/diamond.gif
Hero??

What hero did and result below in white.

- turbo

P.S. I'm new to the fora here... i'm assuming from other posts that 50/9 means voluntarily puts money in 50% of the time and raises pre-flop 9% of the time.

<font color="white">
Hero raised 300, Villain called - and showed pocket aces. </font>