25NL AA rr'ed pot HU turn tough card

[FreshMeat]

Poker Stars - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 9 Players - (LegoPoker Hand History Converter)

SB: $3.40
BB: $19.40
UTG: $23.15
UTG+1: $10.00
MP1: $38.20
Hero (MP2): $28.15
MP3: $18.95
CO: $21.70
BTN: $13.45

Preflop: Hero is dealt A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] (9 Players)
<font color="red">UTG raises to $1.00</font>, 2 folds, <font color="red">Hero raises to $3.25</font>, 5 folds, UTG calls $2.25

Flop: ($6.85) T[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets $4.25</font>, UTG calls $4.25

Turn: ($15.35) K[img]/images/graemlins/spade.gif[/img] &lt;----Great Freaking Card MAN!!! [img]/images/graemlins/confused.gif[/img] (2 Players)
UTG checks, Hero???

26/4/0.49
138 hands

After he called my RR pf and the flop bet i was sure it was JJ-AA, maybe sets. I thought at the time F'it i should go broke with AA all the time in this situation, but later i was wondering why? if he has JJ-QQ the king on the turn will kill action from those hands. if he has the other AA then we are tying, if he has KK then i'm screwed. If i check i can maybe get some value from underpairs on river and perhaps get a cheap showdown if i am beaten... thoughts??? anyone check here?