You're risking 2/3 of your stack against a relative unknown with a strong but not too strong a hand.  If he's as bad a player as his play suggests, just fold and look for a better spot to take him out.  I've been in many situations like this where either I or the opponent is new to the table, and I get put in a situation where it's a difficult decision without any reads.  Without reads, I tend to give the player the benefit of the doubt.  It does suck when these types of situations arise when you don't have information, but I just chalk it up to bad luck that I had to be the first instead of the third person to deal with an overbettor.

Most of the comments are making assumptions about this player's style.  Yes he could be overbetting AI with AK here, he could be overbetting AI with AA here.  You have no idea.  Your inital read was AA/KK.  I'd trust your instincts…you'll still have 40+ BBs.

Of course, if you saw the 33 hand on the 567 board beforehand, it's an easy call.