Two KK hands- check back or keep betting?

[manbearpig]

First rotation for the villain in this hand. Pretty straightforward. Maybe just get it in pre flop but whatever I think. Anyone disagree? But this is just context for the second hand.

Full Tilt Poker No-Limit Hold'em, $0.25 BB (5 handed) Hand History converter Courtesy of PokerZion.com

UTG ($27)
MP ($22.65)
Button ($16.75)
SB ($25.15)
Hero ($64.50)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">SB raises to $0.75</font>, <font color="#CC3333">Hero raises to $2.25</font>, <font color="#CC3333">SB raises to $7.4</font>, Hero calls $4.50.

Flop: ($14.15) K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $8</font>, <font color="#CC3333">Hero raises to $57.75 (All-In)</font>, SB calls $10.40 (All-In).

Turn: ($90.30) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players, 2 all-in)</font>
.

River: ($90.30) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players, 2 all-in)</font>

Final Pot: $90.30

Results in white below: <font color="#FFFFFF">
SB has 9h Th (straight, king high).
Hero has Kc Kh (three of a kind, kings).
Outcome: SB wins $50.95. Hero wins $39.35. </font>


Second hand. Maybe 3 rotations later. The one I want comments on really.

Full Tilt Poker No-Limit Hold'em, $0.25 BB (6 handed) Hand History converter Courtesy of PokerZion.com

CO ($25.65)
Button ($25.60)
SB ($9.65)
BB ($16.75)
UTG ($50)
Hero ($35.70)

Preflop: Hero is MP with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">UTG raises to $0.85</font>, <font color="#CC3333">Hero raises to $2.9</font>, <font color="#666666">4 folds</font>, UTG calls $2.05.

Flop: ($6.15) 7[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $5</font>, UTG calls $5.

Turn: ($16.15) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $13</font>, <font color="#CC3333">UTG raises to $42.1 (All-In)</font>, Hero calls $14.80 (All-In).

River: ($86.05) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players, 2 all-in)</font>
.

Final Pot: $86.05

Results in white below: <font color="#FFFFFF">
UTG has 7h 7d (full house, sevens full of eights).
Hero has Ks Kc (two pair, kings and eights).
Outcome: UTG wins $86.05. </font>

Does anyone check back this turn? The range I put him on was 66 to JJ, and maybe AQ+.