NL25 AK rivers TPTK after double barelling

[jessyj07]

Villain is 38/5/1.5 after ~100 hands. I've been pretty aggressive at this table but only shown down good hands.

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($25)
UTG ($26.60)
UTG+1 ($39.25)
MP1 ($36.15)
MP2 ($14.05)
MP3 ($21.35)
Hero ($63.45)
Button ($24.30)
SB ($8.20)

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Hero raises to $1</font>, <font color="#666666">2 folds</font>, BB calls $0.75.

Flop: ($2.10) 6[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $1.5</font>, BB calls $1.50.

Turn: ($5.10) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $3.5</font>, BB calls $3.50.

River: ($12.10) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero bets?