raised on river oop-what to do?

[RED FACE]

Villain is MP2, 42/14 after too few hands.

No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx (http://www.zerodivide.cx/converter)

UTG ($36.30)
UTG+1 ($97.30)
UTG+2 ($97.51)
Hero ($100)
MP2 ($98.82)
MP3 ($118.14)
CO ($122.25)
Button ($103.40)
SB ($21.13)
BB ($120.50)

Preflop: Hero is MP1 with 4/images/graemlins/club.gif, 4/images/graemlins/diamond.gif. SB posts a blind of $0.50.
<font color="#666666">3 folds</font>, Hero calls $1, MP2 calls $1, <font color="#666666">3 folds</font>, SB (poster) completes, BB checks.

Flop: ($4) Q/images/graemlins/spade.gif, 2/images/graemlins/spade.gif, 9/images/graemlins/heart.gif <font color="#0000FF">(4 players)</font>
SB checks, BB checks, Hero checks, MP2 checks.

Turn: ($4) 4/images/graemlins/spade.gif <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets $3.5</font>, MP2 calls $3.50, SB folds, BB folds.

River: ($11) 8/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $6</font>, <font color="#CC3333">MP2 raises to $20</font>.

The hands I fear are TJ or 2 spades having sp'ed the turn.

[PinkSteel]

Easy, easy, easy fold. You've basically represented the flush, and he's raising. You're toast.

[RED FACE]

My half pot bet on the river could look like a value bet from a very strong hand or scared bet from a moderate hand looking for value from a smaller 9, for instance.

His stats swayed me to call after some thinking even tho I didn't have a lot of hands on him.

He had KTo w T of spades so on the flop he had an inside draw w oc and picked up a T high flush draw on the turn-far too loose a call on turn imo.

I think he made an excellent bluff attempt. I prob would've folded any single pair.