Bet this river?

[Ghazban]

Villain sat down 1 hand ago and I've never seen him before. I felt there was a chance villain was on the club draw but hit that 4 and was trying to price himself in for the river. If he hit the 4, I'm not winning any more and if he was on a draw without it, he's not calling. Then again, maybe he has 99 or something and will call (he could even have JJ/QQ and be playing tight).

Party Poker No-Limit Hold'em, $2 BB (6 max, 6 handed) converter

Hero ($258.90)
MP ($283.55)
CO ($68.65)
Button ($368.90)
SB ($102.09)
BB ($203.62)

Preflop: Hero is UTG with T[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img]. SB posts a blind of $1.
<font color="#CC3333">Hero raises to $8</font>, <font color="#666666">4 folds</font>, BB calls $6.

Flop: ($17) 5[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $12</font>, BB calls $12.

Turn: ($41) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $5</font>, <font color="#CC3333">Hero raises to $35</font>, BB calls $30.

River: ($111) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero??