KK...3 bet the turn?...Raise the river? Or neither?

[Vagos]

Do you guys think I played this too timid or what? Fairly unknown opponent. When he check-raised the turn I thought QJ, which led me to believe the river saved me. I'd be interested to know how others would have played this.

Party Poker 10/20 Hold'em (6 max, 5 handed)

Preflop: Hero is Button with K/images/graemlins/diamond.gif, K/images/graemlins/club.gif.
<font color="CC3333">UTG raises</font>, MP folds, <font color="CC3333">Hero 3-bets</font>, SB folds, BB folds, UTG calls.

Flop: (7.50 SB) 7/images/graemlins/heart.gif, 2/images/graemlins/spade.gif, Q/images/graemlins/heart.gif <font color="blue">(2 players)</font>
UTG checks, <font color="CC3333">Hero bets</font>, UTG calls.

Turn: (4.75 BB) J/images/graemlins/diamond.gif <font color="blue">(2 players)</font>
UTG checks, <font color="CC3333">Hero bets</font>, <font color="CC3333">UTG raises</font>, Hero calls.

River: (8.75 BB) 2/images/graemlins/club.gif <font color="blue">(2 players)</font>
<font color="CC3333">UTG bets</font>, <font color="CC3333">Hero raises</font>, UTG calls.

Final Pot: 12.75 BB
<font color="green">Main Pot: 12.75 BB, between UTG and Hero.</font> &gt; <font color="white">Pot won by Hero (12.75 BB).</font>

Results in white below: <font color="white">
UTG shows Qs Ac (two pair, queens and twos).
Hero shows Kd Kc (two pair, kings and twos).
Outcome: Hero wins 12.75 BB. </font>