From nuts to fold? Cruddy river decision in ginormous pot...

[BrassMonkey]

Don't know much about UTG. BB is aggressive regular.

What do you do on the river here?

PokerStars 3/6 Hold'em (6 handed) internettexasholdem.com

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, BB calls, UTG calls.

Flop: (6.33 SB) 9[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">UTG raises</font>, Hero calls, <font color="#CC3333">BB 3-bets</font>, UTG calls, Hero calls.

Turn: (7.66 BB) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, UTG calls, <font color="#CC3333">Hero caps</font>, BB calls, UTG calls.

River: (19.66 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">UTG raises</font>, Hero?