KK gets donked, or too weak tight?

This is from a Stars $5.50 MTT. Villan seems pretty donkish, but hasn't really played many big hands. I felt dirty after I folded it, but it felt right. Was I wrong?

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter

Hero (t1650)
MP1 (t2793)
MP2 (t2020)
MP3 (t1045)
CO (t1250)
Button (t967)
SB (t570)
BB (t2045)
UTG (t1140)

Preflop: Hero is UTG+1 with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t100</font>, <font color="#666666">1 fold</font>, MP2 calls t100, <font color="#666666">5 folds</font>.

Flop: (t245) J[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP2 checks.

Turn: (t245) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero bets t150, MP2 raises t1450 to t1600 (all-in), Hero folds.

Final Pot: t245