AKs in SB

This guy was about a 18% VPIP 12% PFR over about 300 hands.

Party Poker No-Limit Hold'em, $ BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($135.55)
Hero ($102.80)
BB ($433.89)
UTG ($15.35)
UTG+1 ($87.80)
MP1 ($104.65)
MP2 ($51.96)
MP3 ($103.10)
CO ($46.50)

Preflop: Hero is SB with Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, Khttp://www.flopturnriver.com/phpBB2/...es/diamond.gif. Hero posts a blind of $0.50.
1 fold, UTG+1 calls $1, 4 folds, Button raises to $4, Hero (poster) calls $3.50, 1 fold, UTG+1 calls $3.

Flop: ($13) Jhttp://www.flopturnriver.com/phpBB2/...iles/spade.gif, 9http://www.flopturnriver.com/phpBB2/...es/diamond.gif, 9http://www.flopturnriver.com/phpBB2/...miles/club.gif (3 players)
Hero checks, UTG+1 checks, Button checks.

Turn: ($13) Ahttp://www.flopturnriver.com/phpBB2/...miles/club.gif (3 players)
Hero checks, UTG+1 checks, Button bets $12, Hero calls $12, UTG+1 folds.

River: ($37) 7http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero bets $20, Button calls $119.55 (All-In), Hero ?????

3 bet him pre-flop