Crazy Eyes: A Warning Sign or a Post-Psychotic Episode Manifestation?

So, I have been noticing a little phenomenon for say, the past year or so. Every time there is a picture in a newspaper or news site of someone who has just committed murder or some other heinous crime, they have complete crazy eyes. Somewhat recent examples include Christopher Offord, the man who bludgeoned his wife to death with a claw hammer because she wanted to cuddle after sex and he wanted to watch sports on television. He was recently sentenced to death.

Notorious examples include Charles Manson, who has definite incredibly crazy eyes, Timothy McVeigh, with his creepy intense stare, crazy nurse killing Richard Speck, Terry Nichols, McVeigh's accomplice who looks even crazier than McVeigh, and Jennifer Wilbanks, who wins the award for Craziest Eyes of a Non-Killer.

My question has two parts - first, did these people always have crazy eyes, or did their wild-eyed, glass stares of insanity emerge following their arrests? It's also notable that there are many killers who definitely do not LOOK crazy. Of course, many of them are not. Many are simply just evil, or sociopathic, which as I understand is quite different from being psychotic.

Secondly - how did others around them NOT NOTICE the crazy eyes? Honestly. If presumably they looked that way all the time, how in the world did Christopher Offord get his wife to marry him?

Do I have crazy eyes?!!