AK easy fold?

[praios]

Party Poker - No Limit Hold'em Cash Game - $3/$6 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $625.35
BB: $130.25
UTG: $2,257.50
Hero (MP): $600.00
CO: $682.75
BTN: $585.00

Preflop: Hero is dealt A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] (6 Players)
UTG folds, <font color="red">Hero raises to $21.00</font>, CO calls $21.00, BTN folds, SB calls $18.00, BB folds

Flop: ($69) 4[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (3 Players)
SB checks, Hero checks, CO checks

Turn: ($69) A[img]/images/graemlins/club.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $49.00</font>, <font color="red">CO raises to $130.00</font>, SB folds, Hero calls $81.00

River: ($329) 8[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets all-in for $531.75</font>, Hero folds
Uncalled bet of $531.75 returned to CO

Pot Size: $329.00


psykotow alias psychobenny is villian 21/17/3.2/27
aset he must raise on the flop an a fd he would bet there also i think so taht to do on the rivr cann this be a crazy bluff?