50NL - KK in 3-bet pot, villain check-calls flop, donks turn

[badatmath]

I didn't think the 3 could improve him, and after check-calling the 2 heart flop I thought it looked like he had a draw and wanted to price himself in. AhQh is the only hand I could think of that made a little sense. What do you think?

Thanks, Matt

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($44.95)
Button ($22.75)
SB ($57)
BB ($20.45)
UTG ($28.65)
UTG+1 ($50)
MP1 ($50.80)
MP2 ($30)
Hero ($53.35)

Preflop: Hero is MP3 with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises to $1.5</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $4.5</font>, <font color="#666666">4 folds</font>, UTG+1 calls $3.

Flop: ($9.75) 6[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG+1 checks, <font color="#CC3333">Hero bets $6</font>, UTG+1 calls $6.

Turn: ($21.75) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG+1 bets $5.5</font>, <font color="#CC3333">Hero raises to $16.5</font>, <font color="#CC3333">UTG+1 raises to $39.5</font>, Hero calls $23.

River: ($100.75) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: $100.75

[The Eureka Kid]

Initially, it looks like he is trying to slow you down. Could be a hand with a jack in it as well. When he three-bets on the turn, I'm a little worried, but I think your hand is good here 1/3 easily. I bet more on the flop and raise more on the turn, otherwise I think this hand was pretty well played.

[AllTheCheese]

Raise to $5.50 preflop. Bet 75% pot on flop. Go broke on that turn.

[Mike Kelley]

Any reads or stats on villain?