50NL: KK preflop sanity check

[Paradroid]

Villain is 18/4.7/1.7 over 125 hands.

PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

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

BB ($47.05)
UTG ($41.85)
UTG+1 ($42.95)
MP1 ($67.10)
Hero ($20.45)
CO ($47.50)
Button ($50.60)
SB ($56.45)

Preflop: Hero is MP2 with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $1</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $3.5</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">UTG raises to $6</font>, Hero ???.

Final Pot: $7.75

Do I have to go broke here with a 40 BB stack, or does UTG's two min-raises just stink too much?