Big PL Hold 'Em river bet, what do you think?

[Dave5511]

Okay, PL .25/.50 $50 buy in at Party. UTG limps, folds to cut off who limps, button raises to 2.75. I'm SB, raise to $9.5 w/ 2 red nines.

** Dealing Flop ** [ Js, 4c, 8s ]

SB bets [$12].
Button calls [$12].

** Dealing Turn ** [ 4s ]

SB bets [$15].
Button calls [$15].

** Dealing River ** [ Jc ]
SB checks.
Button bets all-In [$37.3]

I think for a bit here. Of course, AA, KK, QQ come to mind. Even AJ or KJ are hands I'm thinking about now.

However, the fact that he just called the big rasies/bets prelfop, flop, and turn can't escape my mind.

I think if he had AA, KK, QQ, he would have moved in on the TURN to try to capture the $15 bet then.

I think a bit longer, and finally decide he has AK.

What do you think?