AK hits TPTK on dangerous board, 50NL

First post, just had a hand which got me thinking about a situation which often comes up in raised and reraised pots. Perhaps it's standard -- if so, I'd like to hear what the standard is. I sat down just a few orbits ago, so all I have on villain is 28/17 in 20 hands, for what it's worth.

Party Poker No-Limit Hold'em, $0.50 BB (6 max, 6 handed) converter

Button ($71.95)
SB ($34.80)
BB ($50)
Villain ($62.25)
MP ($49.25)
Hero ($38.75)

Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.25.
<font color="#CC3333">Villain raises to $2</font>, MP calls $2, <font color="#CC3333">Hero raises to $8</font>, <font color="#666666">3 folds</font>, Villain calls $6, MP folds.

Flop: ($18.75) T[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Villain checks, <font color="#CC3333">Hero bets $18</font>, <font color="#CC3333">Villain raises to $36</font>, Hero calls $12.75 (All-In).

Turn: ($85.50) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

River: ($85.50) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: $85.50

I potted the dangerous flop almost as a reflex. Then felt I was too pot-committed to fold. But after thinking about it, the only hand I'm beating is probably QQ (though I do need to bet if he has QQ).