TP w/flush draw tough river decision

[Asufiji2004]

Intertops 25NL. No reads only 10 hands with villian.

Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

MP2 ($17.80)
MP3 ($13.45)
CO ($6)
Button ($22.50)
SB ($25.82)
BB ($37.15)
UTG ($14.30)
Hero ($24.15)
UTG+2 ($42.99)
MP1 ($9.30)

Preflop: Hero is UTG+1 with T[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.25. SB posts a blind of $0.10.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $1</font>, UTG+2 calls $1, <font color="#666666">7 folds</font>.

Flop: ($2.60) 3[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $2</font>, UTG+2 calls $2.

Turn: ($6.60) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, UTG+2 checks.

River: ($6.60) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG+2 bets $6</font>, Hero?????