KK, tough spot in reraised pot

[Jeans]

Poker Room skin
Pot Limit Holdem Ring game
Blinds: $1/$2
5 players
Converter

Stack sizes:
UTG: $267.05
CO: $178
Button: $100
SB: $289.70
Hero: $584.85

Pre-flop: (5 players) Hero is BB with K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
<font color="#cc0000">UTG raises to $8</font>, 3 folds, <font color="#cc0000">Hero raises to $25</font>, UTG calls.

Flop: 5[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] ($51, 2 players)
<font color="#cc0000">Hero bets $40</font>, UTG calls.

Turn: 9[img]/images/graemlins/heart.gif[/img] ($131, 2 players)
Hero checks, <font color="#cc0000">UTG bets $100</font>, <font color="#cc0000"> <font color="#cc0000">Hero raises all-in $517.85</font>

The villain is a tag 19/14/4 and I haven't been 3betting him lightly or anything. Ok so I figured on the flop I guess I'm okay, although not only AA but QQ also beats me now, when I bet and get called, it rings alarm bells, I guess it could be TT/JJ which want to know if I have something, but the turn isn't a nice card, it completes the flush and 78 straight. So I feel really lost on the turn. What would you guys do here? I thought about check folding, bet folding and check raising AI, but I don't really know which is the best option? I think leading out the turn will leave me committed to the pot.