TPTK vs. 4-straight board -- river plan?

[SkittleBrau]

UTG is loose and pretty passive preflop (67/5). He seems to be rather passive post-flop as well.

Ultimate Bet 2/4 Hold'em (5 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is Button with A/images/graemlins/diamond.gif, K/images/graemlins/heart.gif.
UTG calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, SB calls, BB calls, UTG calls.

Flop: (8 SB) K/images/graemlins/club.gif, Q/images/graemlins/heart.gif, 3/images/graemlins/heart.gif <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>, SB folds, BB folds, UTG calls.

Turn: (6 BB) J/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, UTG calls.

River: (8 BB) 9/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
UTG checks...

Hero's plan?

[SkittleBrau]

Nobody? Bet-fold?

[kslghost]

bet-call, IMO. No reason to put him on a T, mostly because he checked.

I could see some reasons for checking to showdown, but with your read on him, its more likely he is just playing TP. I would not fold in this situation in any case, unless I had a perfect read on what situations the player tends to bluff. (And still extremely unlikely)