Odd situation with KK vs Donkish minraiser

[MTBlue]

Turn and River felt botched. Villain is an unknown. He minraised KJ in the last orbit. Bet 1/6 of the pot with his gutshot on the turn and pushed when he hit on the river. I assume he's not very good judging by bet sizing and he's only on one of my tables.

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

MP ($248.40)
CO ($163.65)
Button ($432.80)
SB ($404)
Hero ($404)
UTG ($660.30)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $6.
<font color="#666666">2 folds</font>, CO (poster) checks, <font color="#CC3333">Button raises to $8</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $40</font>, CO folds, Button calls $32.

Flop: ($88) T[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $65</font>, Button calls $65.

Turn: ($218) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $165</font>, Button calls $165.

River: ($548) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $140</font>, Hero calls.