Knocked out holding KK -- misplayed?

[MSchmahl]

I finished 37th out of 589, with T470k in play.

Should I have laid down my kings against twin8s' check-raise? Folding would have left me at T3165, from where I would be blinded out soon. I thought it was so outlandish that my opponent would have played 86 for three bets that I was sure I was up against either a bluff, AJ, or AA. I didn't have a good read on my opponents, as I had been moved to this table about 10 minutes prior.

What do you think of twin8s' play?

Tournament hand history

[limits 1000 - 2000]
Multi-table Tourney Hand #9,241,001 (real money) played at 23 Nov 2002 5:03 PM (ET)

Seat 1: TheGecko ($4,755 in chips)
Seat 2: riverlove ($1,550 in chips)
Seat 3: Obwan ($2,180 in chips)
Seat 5: MCSlacky ($17,290 in chips)
Seat 6: twin8s ($30,715 in chips)
Seat 7: YouSirryGuy ($18,025 in chips)
Seat 8: MSchmahl ($9,165 in chips)
Seat 9: upland ($4,390 in chips)
Seat 10: carp22 ($7,325 in chips)
(MSchmahl is the dealer)
(Small blind posted by upland, big blind by carp22)

PRE-FLOP
upland posts blind, carp22 posts blind, TheGecko calls, riverlove folds, Obwan raises, MCSlacky folds, twin8s calls, YouSirryGuy folds, MSchmahl raises, upland folds, carp22 folds, TheGecko calls, Obwan is all-in, Obwan calls, twin8s calls.

FLOP [board cards: JC, 9H, 5D]
TheGecko checks, twin8s checks, MSchmahl bets, TheGecko calls, twin8s calls.

TURN [board cards: JC, 9H, 5D, 7S]
TheGecko checks, twin8s checks, MSchmahl bets, TheGecko folds, twin8s raises, MSchmahl calls.

RIVER [board cards: JC, 9H, 5D, 7S, 3C]
TheGecko checks, twin8s checks, MSchmahl bets, TheGecko folds, twin8s raises, MSchmahl calls.

SHOWDOWN
twin8s shows [8H,6H]
MSchmahl shows [KH,KS]
Obwan shows [AC,8C]

SUMMARY
Pot: $26,845
twin8s collects $26,845