AK hits flop but faces huge overbet

[IceCrystal]

I had A[img]/images/graemlins/spade.gif[/img],K[img]/images/graemlins/spade.gif[/img] on the BB. The SB is 19/8 after 95 hands. What could he have? Was it a good call by me, or not?

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Played at iPoker network
6 players, seat 1 is the button

Seat 1: BTN ($113.05)
Seat 3: SB ($163.40)
Seat 5: BB ($149.70)
Seat 6: UTG ($71.25)
Seat 8: UTG+1 ($147.45)
Seat 10: CO ($209.20)

SB posts small blind, $0.50
BB posts big blind, $1.00

UTG folds
UTG+1 folds
CO raises to $4
BTN calls
SB calls
BB raises to $23
CO folds
BTN folds
SB calls

Dealing flop: (Pot is $54.00)
6[img]/images/graemlins/heart.gif[/img],A[img]/images/graemlins/diamond.gif[/img],5[img]/images/graemlins/club.gif[/img]

SB is all-in $140.4
BB is all-in $126.7

Dealing turn: (Pot is $321.10)
T[img]/images/graemlins/heart.gif[/img]

Dealing river: (Pot is $321.10)
2[img]/images/graemlins/spade.gif[/img]

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