[benwood]

Bet the river.
(1)He's not likely to have a straight.A 9 & a J are already gone so he had to hit a 3 card draw to make it.
(2)If he has only 1 pair he is likely to call you for the size of the pot.
(3)He can't raise unless his hand can beat A's up(not likely),so you can fold comfortably to a raise.
(4)If you check,he's not going to bluff at it,because he knows you will like call with a pair of A's because of the pot size.