NL10 KK vs unknown - massive overbet on Q high flop

[Brocken]

Party Poker No-Limit Hold'em, $0.10 BB (10 handed) Party Poker Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($6.89)
SB ($10.05)
BB ($4.51)
UTG ($9.10)
UTG+1 ($12.21)
Hero ($10.40)
MP1 ($2.76)
MP2 ($9.85)
MP3 ($9.85)
CO ($18.80)

Preflop: Hero is UTG+2 with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.4</font>, <font color="#666666">3 folds</font>, CO calls $0.40, <font color="#666666">3 folds</font>.

Flop: ($0.95) T[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.7</font>, <font color="#CC3333">CO raises to $4.5</font>, Hero ...

Villain is an unknown.

I guess I'm ahead of his range, but I don't if he'd do this with AQ or KQ or something because I've never played him before.