How do you find this River raise ?

[Mig]

UTG is a maniac who will cap any piece from a gutshot to bottom pair, SB decent, nothing special... If someone has TPNK it's probably UTG...
I thought he would fold it with a river raise. Any thought on that move ?

Party Poker 10/20 Hold'em (6 max, 5 handed) converter

Preflop: Hero is Button with J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, UTG calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, SB calls, UTG calls.

Flop: (6 SB) 6[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">UTG raises</font>, <font color="#CC3333">Hero 3-bets</font>, SB calls, <font color="#CC3333">UTG caps</font>, Hero calls, SB calls.

Turn: (9 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">UTG bets</font>, Hero calls, SB calls.

River: (12 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>

Final Pot: 15 BB