Anyone fold to this river raise?

[steveyz]

Party Poker 15/30 Hold'em (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is SB with A/images/graemlins/spade.gif, A/images/graemlins/heart.gif. CO posts a blind of $15.
<font color="#CC3333">UTG raises</font>, <font color="#666666">7 folds</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">UTG caps</font>, Hero calls.

Flop: (10 SB) T/images/graemlins/club.gif, 5/images/graemlins/club.gif, 2/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>, UTG calls.

Turn: (7 BB) 4/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, <font color="#CC3333">Hero 3-bets</font>, UTG calls.

River: (13 BB) J/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, Hero ???

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Villian is a solid player. I feel like he has JJ here almost 100% of the time.

[Kaz The Original]

Check raise the river. Does KK and QQ really check behind?