50 PLO Nut straight on turn but I have no draws

[Grandezza]

Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $51.10
UTG+1: $47.95
CO: $121.20
Hero: $75.65
SB: $44.45
BB: $44.20

Pre-flop: (6 players) Hero is Button with T[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/spade.gif[/img]
UTG calls, UTG+1 calls, CO calls, Hero calls, SB calls, BB checks.

Flop: 8[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] ($3, 6 players)
SB checks, BB checks, UTG checks, UTG+1 checks, <font color="#cc0000">CO bets $3</font>, Hero calls, 4 folds.

Turn: T[img]/images/graemlins/diamond.gif[/img] ($9, 2 players)
<font color="#cc0000">CO bets $9</font>, Hero calls.

River: 4[img]/images/graemlins/diamond.gif[/img] ($27, 2 players)
<font color="#cc0000">CO bets $27</font>

My stats on villain 48/1.5/1.5 or something like that. over 90 hands.

All I know about him that seems to be of importance is that he didn't bet his nut straight when the board paired on the river in a 3-way pot (pretty standard meh).

I guess what I'm asking is how often does he have QJ here?
If i should just call the turn then what do I do if I have an ace?

River is an obvious fold i suppose?