Live AK top pair, facing turn shove

[CPHoya]

Playing live at the Bike. Villain hasn't gotten too far out of line, is cautious with preflop raises, and usually folds to pressure. However, he's uncomfortable at the table and seems phased by playing live, or something. My image is relatively tight post-flop, but loose pre, if he's listening to the table. Structure is $2/$3.

HERO: $245
VILLAIN: $300

Everyone else doesn't matter.

Dealt to HERO: A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img]

PRELFOP: UTG folds, <font color="red">VILLAIN raises to $10</font>, 1 fold, <font color="red">HERO raises to $50</font>, rest fold, VILLAIN cold calls. Hero thinks "huh?"

FLOP: 9[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img]

VILLAIN checks, HERO checks.

TURN:9[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img]

VILLAIN checks, HERO bets $40, <font color="red">VILLAIN raises all-in</font>, HERO . . .

Preemption: I hate my flop check, looking at it like this. I really did have a suspicion that this was a c/r I could not call, though.