50NL; flop top set, turn is 3 to a flush

[Lego05]

Advice on eaarlier streets is appreciated. What's the move on this river shove?

UTG is 62.65/34.94/1 over 83 hands.

CO is 27.86/5.57/.54 over 323 hands.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool (http://poker-tools.flopturnriver.com/Hand-Converter.php) from FlopTurnRiver.com (http://www.flopturnriver.com) (Format: 2+2 Forums)

Button ($49.90)
Hero ($55)
BB ($78)
UTG ($115.40)
MP ($59.50)
CO ($53.20)

Preflop: Hero is SB with 9/images/graemlins/heart.gif, 9/images/graemlins/spade.gif.
UTG calls $0.50, <font color="#666666">1 fold</font>, CO calls $0.50, <font color="#CC3333">Button raises to $1.5</font>, Hero calls $1.25, <font color="#666666">1 fold</font>, UTG calls $1, CO calls $1.

Flop: ($6.50) 7/images/graemlins/club.gif, 9/images/graemlins/club.gif, 4/images/graemlins/heart.gif <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets $4.25</font>, UTG calls $4.25, CO calls $4.25, Button folds.

Turn: ($19.25) 2/images/graemlins/club.gif <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG bets $9</font>, CO calls $9, Hero calls $9.

River: ($46.25) A/images/graemlins/diamond.gif <font color="#0000FF">(3 players)</font>
Hero checks, UTG checks, <font color="#CC3333">CO bets $38.45 (All-In)</font>, Hero ??? UTG ....

[cb4mvp]

Easy river fold. Heads up this might be a little tougher, but three way it's very obvious somebody has hit a flush.

edit: On the flop, I probably bet full pot or even a little more. Perhaps that kills the value of your hand, but in a three-way pot I think you have to protect your hand a bit more as they have great odds to continue on their draw. On the turn, you're pretty obviously behind and it's unlikely you have any fold equity.

On the turn, I don't mind calling. You're getting, what, 4-1 with ten outs? The flush may not pay you off if the board pairs for you, but it's not likely he would have folded to your turn push anyway.

I may be way off here, so please flame away. I'd like to know how other players would handle this situation as well.

[Lemniscate]

I'd just shove the turn.

[Machavelli]

Pre-flop should be raised to 2.5

Against 3 villains on such a draw heavy flop you need to pot it.

As much as it sucks, river is a clear fold.