TPTK meets turn aggression

[Kyriefurro]

Villain is 23.5/3.35/1.8 after 1700 hands.

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is MP3 with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, BB calls, UTG calls, UTG+1 calls.

Flop: (8.50 SB) K[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, UTG+1 checks, <font color="#CC3333">Hero bets</font>, BB calls, UTG calls, UTG+1 folds.

Turn: (5.75 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, BB calls, <font color="#CC3333">UTG raises</font>, <font color="#CC3333">Hero 3-bets?</font>

Is the raise correct here or too aggressive? And if villain caps (he did), what do I do on the river?