.50/1 big slick gets a K on river?

[pgjcbsn]

Just wondering if you guys would suggest rasing or just calling here? Also should I have bet the turn?

Poker Stars
Limit Holdem Ring game
Limit: $0.50/$1
10 players
Converter

Stack sizes:
UTG: $20.25
UTG+1: $18.30
UTG+2: $16.55
MP1: $16.35
MP2: $13.30
MP3: $20.95
hero: $12.05
Button: $21.65
SB: $19.70
BB: $45.65

Pre-flop: (10 players) hero is CO with K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img]
UTG calls <font color="aaaaaa">(1.5:1)</font>, 2 folds, MP1 calls <font color="aaaaaa">(2.5:1)</font>, 2 folds, <font color="#cc0000">hero raises</font>, 3 folds, UTG calls <font color="aaaaaa">(5.5:1)</font>, MP1 calls <font color="aaaaaa">(6.5:1)</font>.

Flop: J[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/club.gif[/img] (7.5SB, 3 players)
UTG checks, MP1 checks, <font color="#cc0000">hero bets</font>, UTG calls <font color="aaaaaa">(8.5:1)</font>, MP1 calls <font color="aaaaaa">(9.5:1)</font>.

Turn: 4[img]/images/graemlins/heart.gif[/img] (5.25BB, 3 players)
UTG checks, MP1 checks, hero checks.

River: K[img]/images/graemlins/heart.gif[/img] (5.25BB, 3 players)
<font color="#cc0000">UTG bets</font>, MP1 folds, hero ?