AK on river

UTG is 43/17/1.6

Party Poker 10.00/20.00 Hold'em <font color="#0000FF">(6 handed)</font> link (http://www.darksun.lunarpages.com/poker/)

Preflop: Hero is SB with A/images/graemlins/spade.gif, K/images/graemlins/diamond.gif.
UTG calls, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 folds</font>, UTG calls.

Flop: (5.00 SB) 6/images/graemlins/diamond.gif, 9/images/graemlins/heart.gif, 8/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, Hero calls.

Turn: (4.50 BB) A/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls

River: (6.50 BB) 7/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, Hero

Is 9.5:1 enough to call?

[wackjob]

I'd probably fold unless I had a note on this guy saying he has a habit of bluff raising scare cards.