10/10 25 (straddle) live game

I’m
most interested hearing thoughts about my play on turn, though flop play is
also certainly debatable.  UTG is not an
unreasonably aggressive player, but so far won most of his pots without a
showdown.  

BN: $4604.87

SB: $4163.80

BB: $4300 (Hero)

UTG: $5600.20

HJ: $1684

CO:
$6887.80 

Preflop($300) (6 Players)

Hero was dealt 4h 5d 7s 9h

HJ folds, CO raises
to $80, BN folds, SB folds, Hero calls
$80, UTG calls $80, HJ calls $80 

Flop($340.00) 3d 6d 7c (4 Players)

Hero checks, UTG checks, HJ checks, CO checks 

Turn($340.00) 3d 6d 7c  KC(4 Players) 

Hero bets $300, UTG raises
to $1240, HJ folds, CO folds, Hero calls $1240 

River
($2820.00) 3d 6d 7c  KC 3s(2 Players)

Hero checks, CO bets
$2800        Hero?