Weak/tight to go into calldown mode?

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I had Villain (UTG) here read as a TAG, so when he bets into me again on the turn, I slowed down. Do I bet/fold this river? MP1 was a typical maroon.

All comments appreciated.

Party Poker 0.50/1 Hold'em (10 handed) converter

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, MP1 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, <font color="#666666">2 folds</font>, UTG calls, MP1 calls.

Flop: (9.50 SB) 9[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">UTG bets</font>, MP1 calls, <font color="#CC3333">Hero raises</font>, Button folds, UTG calls, MP1 calls.

Turn: (7.75 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets</font>, MP1 calls, Hero calls.

River: (10.75 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, MP1 checks, Hero checks.

Final Pot: 10.75 BB

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At 3/6 on Pacific last night I had someone play 99 the same way. I just called down from the turn. But with the other player padding the pot I think you have to raise.