$200 PLO8 - Interesting river decision with nut-nut

[jlacks]

UTG is 45 3 after 64 hands
MP3 is 41 10 after 39 hands
No other reads

PokerStars Pot-Limit Omaha/8, $2 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($102.25)
SB ($290.75)
BB ($191.65)
UTG ($97)
UTG+1 ($24.35)
MP1 ($140.75)
Hero ($259.90)
MP3 ($269.90)
CO ($194.95)

Preflop: Hero is MP2 with A[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img].
UTG calls $2, <font color="#666666">2 folds</font>, Hero calls $2, MP3 calls $2, <font color="#666666">3 folds</font>, BB checks.

Flop: ($9) 2[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets $4</font>, <font color="#CC3333">MP3 raises to $10</font>, BB folds, UTG calls $10, Hero calls $6.

Turn: ($39) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets $37.1</font>, Hero calls $37.10, MP3 calls $37.10.

River: ($150.30) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets $47.9 (All-In)</font>

Hero???