50 NL Full Ring- KQ suited deep stacked

[brea]

I was almost certain the villain was on a draw. When he pushed on the river. I wasn't certain what the best line was. I think I played this hand incredibly poorly. With that being said, what cards did he have that he should push with?? Results posted later. Thanks.
PokerStars No-Limit Hold'em, $0.50 BB (9 handed) internettexasholdem.com

CO ($55.25)
Button ($68.60)
SB ($31.35)
Hero ($146.85)
UTG ($55.70)
UTG+1 ($91)
MP1 ($47.60)
MP2 ($44.35)
MP3 ($49.25)

Preflop: Hero is BB with :qd, :kd.
[color=#666666]3 folds</font>, [color=#CC3333]MP2 raises to $1</font>, [color=#666666]1 fold</font>, CO calls $1, Button calls $1, SB calls $0.75, Hero calls $0.50.

Flop: ($5) :kh, :8d, :3h [color=#0000FF](5 players)</font>
SB checks, Hero checks, MP2 checks, [color=#CC3333]CO bets $3</font>, Button folds, SB calls $3, [color=#CC3333]Hero raises to $9</font>, MP2 folds, CO calls $6, SB calls $6.

Turn: ($32) :5s [color=#0000FF](3 players)</font>
SB checks, [color=#CC3333]Hero bets $17</font>, CO calls $17, SB folds.

River: ($66) :2c [color=#0000FF](2 players)</font>
Hero checks, [color=#CC3333]CO bets $28.25 (All-In)</font>, Hero calls $28.25.

Final Pot: $122.50