Check behind on turn with KK?

[macaroni]

Villain and I haven't played a hand together yet. I did see him make a pretty horrible play on another table we're at. Check behind here or just sick the rest in?

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($112.80)
UTG ($26.30)
MP ($172.95)
CO ($79.70)
Hero ($111.35)
SB ($84.40)

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, CO calls $1, <font color="#CC3333">Hero raises to $5</font>, SB calls $4.50, <font color="#666666">1 fold</font>, CO calls $4.

Flop: ($16) 2[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $11</font>, CO folds, <font color="#CC3333">Hero raises to $33</font>, SB calls $22.

Turn: ($82) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero ??