arrrgh, river flush but not sure if villian has better flush

[MattHH]

UTG+1 is a donkey, everyone else is unknown. This river gets ugly.

Poker Stars, $0.50/$1 Limit Hold'em Cash Game, 9 Players
LeggoPoker.com - Hand History Converter

Pre-Flop: 9[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img] dealt to Hero (BB)
UTG folds, UTG+1 calls, UTG+2 calls, MP1 folds, MP2 calls, CO folds, BTN calls, SB calls, Hero checks

Flop: (6 SB) 4[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] (6 Players)
<font color="red">SB bets</font>, Hero calls, <font color="red">UTG+1 raises</font>, UTG+2 folds, MP2 calls, BTN folds, SB calls, Hero calls

Turn: (7 BB) 9[img]/images/graemlins/club.gif[/img] (4 Players)
SB checks, Hero checks, <font color="red">UTG+1 bets</font>, MP2 calls, SB calls, Hero calls

River: (11 BB) 6[img]/images/graemlins/heart.gif[/img] (4 Players)
SB checks, Hero checks, <font color="red">UTG+1 bets</font>, <font color="red">MP2 raises</font>, SB calls, Hero calls, <font color="red">UTG+1 3-bets</font>, <font color="red">MP2 caps</font>, SB folds, Hero ?