Stars 20/180 TPTK River Decision

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PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG (t1530)
UTG+1 (t1420)
MP1 (t1510)
MP2 (t1180)
MP3 (t1700)
CO (t1710)
Hero (t1550)
SB (t1400)
BB (t1500)

Please read the following disclaimer before responding to this post: I RAISE PRE HERE 90% OF THE TIME...

UTG+1 is pokerdogAA, a good player (i think), who won the daily 50 grand last week. Go ahead and flame for not raising preflop/flop. On the flop i thought that MP3 prob had a FD too, so i didn't want to blow him off the hand. When UTG+1 leads again when the K hits the turn, i have to give him > TP here right? Given this read...is the river a fold (getting almost 4 to 1?)

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls t20, UTG+1 calls t20, <font color="#666666">2 folds</font>, MP3 calls t20, <font color="#666666">1 fold</font>, Hero calls t20, SB completes, <font color="#666666">1 fold</font>.

Flop: (t120) J[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, UTG checks, <font color="#CC3333">UTG+1 bets t100</font>, MP3 calls t100, Hero calls t100, SB folds, UTG folds.

Turn: (t420) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets t240</font>, MP3 calls t240, Hero calls t240.

River: (t1140) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets t400</font>, MP3 folds, Hero...?