How much respect do I give this guy?

[FoxwoodsFiend]

5/10 live game at the casino morongo.
UTG is a supertight old player who has only pushed in twice, once with a set on the turn and the other time with a nut flush. I've seen him play K10 suited for a decent pot, but only with position and he doesn't even raise with QQ in MP preflop. Button is just a complete idiot-he's called my reraise for $200 preflop with A5 suited and puts in a small raise on the button every hand.
UTG has $1000, Button has $4000, I have $3300.
I'm dealt K [img]/images/graemlins/heart.gif[/img] Q [img]/images/graemlins/diamond.gif[/img] in the big blind. UTG limps. Folded to the button who makes it 25. I call, UTG calls.
Flop comes down K [img]/images/graemlins/spade.gif[/img] 4 [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img]
I check, UTG bets 35, Button calls. I raise to $135. UTG and button call.
Turn comes K [img]/images/graemlins/heart.gif[/img] I bet out for $120, two callers.
River comes 8 [img]/images/graemlins/club.gif[/img]
At this point, I'm worried about what UTG could have so I check. I check, he immediately moves all-in for $720. Button folds. Do I call or fold in this spot?