NL600 wtf deep river spot

[Schmitty 87]

CO just sat in so readless. UTG plays 70/2/0.7. I've been isolating him a lot, and he hasn't shown any tendency to play back. River is um, what!?!?? J10 is likely a huge part of his range, but so is KQ and Ax spades probably (weighted more heavily toward KQ). I think he'd call a sizable river raise with two pair, but I obviously can't know for sure.

edit: this converted weird because there was no small blind, but action is correct.

Full Tilt Poker - No Limit Hold'em Cash Game - $3/$6 Blinds - 5 Players - (LegoPoker Hand History Converter)

BB: $602.85
UTG: $2,102.70
Hero (UTG): $1,601.40
CO: $600.00
BTN: $600.00

Preflop: Hero is dealt 6[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img] (5 Players)
UTG calls $6.00, <font color="red">Hero raises to $24.00</font>, CO calls $24.00, 2 folds, UTG calls $18.00

Flop: ($78) K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] (3 Players)
<font color="red">UTG bets $36.00</font>, <font color="red">Hero raises to $108.00</font>, CO calls $108.00, UTG calls $72.00

Turn: ($402) 8[img]/images/graemlins/diamond.gif[/img] (3 Players)
UTG checks, <font color="red">Hero bets $400.00</font>, <font color="red">CO raises all-in to $468.00</font>, UTG calls $468.00, Hero calls $68.00

River: ($1806) A[img]/images/graemlins/diamond.gif[/img] (3 Players - 1 All-In)
<font color="red">UTG bets $6.00</font> (yes $6), Hero ???