Can you fold this?

I know i probably shouldn't of checked the flop - tried to "trap" - with the ace on the river - A/A was definately in his range.. but could i fold this?

Getting Hand History Information...
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Hand #42331774-45818 at Crystal (No Limit Hold'em)
Started at 21/Jun/07 22:01:54

sneaky5720 is at seat 0 with $17.60.
Muppet Style is at seat 1 with $51.85.
Memphis is at seat 2 with $112.30.
ccccarl is at seat 3 with $57.20.
rondgreat is at seat 4 with $40.45.
coldoutside is at seat 5 with $36.
wildsalmon is at seat 6 with $25.
skydiver99 is at seat 7 with $14.50.
HERO is at seat 8 with $50.90.
banditsu14 is at seat 9 with $51.75.
The button is at seat 4.

coldoutside posts the small blind of $.25.
wildsalmon posts the big blind of $.50.

sneaky5720: -- --
Muppet Style: -- --
Memphis: -- --
ccccarl: -- --
rondgreat: -- --
coldoutside: -- --
wildsalmon: -- --
skydiver99: -- --
HERO: Kh Ac
banditsu14: -- --

Pre-flop:

skydiver99 folds. HERO raises to $2. banditsu14
re-raises to $6.75. sneaky5720 folds. Muppet Style
folds. Memphis folds. ccccarl folds. rondgreat
folds. coldoutside folds. wildsalmon folds.
HERO calls.

Flop (board: Jc Kd Kc):

HERO checks. banditsu14 checks.

Turn (board: Jc Kd Kc 3s):

HERO bets $8. banditsu14 calls.

River (board: Jc Kd Kc 3s Ad):

HERO bets $20. banditsu14 goes all-in for $37.
HERO goes all-in for $36.15. banditsu14 is
returned $.85 (uncalled).



Showdown:

banditsu14 shows Ah As.
banditsu14 has Ah As Kd Kc Ad: full house, aces full of kings.
HERO shows Kh Ac.
HERO has Kh Ac Kd Kc Ad: full house, kings full of aces.


Hand #42331774-45818 Summary:

$3 is raked from a pot of $102.55.
banditsu14 wins $99.55 with full house, aces full of kings.
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