River fold?

[Swiss Cheese]

Live 10-20 utg open limper, next player to my direct right open raises this means a pair 77 or above or AK. I have AA and 3 bet everybody folds including the open limper....strange for this game actually.

Flop J [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/heart.gif[/img]
Check,bet, call

Turn 9 [img]/images/graemlins/heart.gif[/img]
Check, bet, call

River 7 [img]/images/graemlins/club.gif[/img]
check, bet, checkraise

Fold? I really can't call with this can I?(raising is not even a consideration) If I really feel he is weak(but not ultraweak) loose. Thanks I appreciate the input.

Swiss Cheese