Simple AK preflop

[darnold305]

Sorry for such a boring post but I've been having trouble in these spots lately

Villain is unknown

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($104.35)
Button ($31.50)
SB ($145)
BB ($112.05)
UTG ($117.50)

Preflop: Hero is MP with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $4</font>, Button calls $4, SB calls $3.50, <font color="#CC3333">BB raises to $25</font>, <font color="#CC3333">Hero ???