Is there any way of getting information on deleted users? This deleted answer was created by user1413, from context this appears to be littleadv. Is there some way I can find out more information on what happened? Did the user delete their own account, or was their account deleted by a moderator? Is this a community decision, or does a single diamond moderator do so single-handedly?
You can safely assume that the user requested for their account to be removed, moderators (that we don't have yet) and SE employees wouldn't remove an account without the user asking for it, with the exception of obvious spam accounts.
I'm not so sure what more information you are looking for, but I'm afraid this is all that you'll get, there's absolutely no reason for specifics to be discussed publicly.
That particular user requested that their account be deleted. So it was deleted.
As Yannis notes, that's generally how it works.
First of all, I can confirm practically Yannis' theoretical answer above. I saw a meta discussion by that user where the user requested a diamond mod to delete their account and was directed by a mod to a standard "please delete my account" request form.
Second, community NEVER gets to decide to delete someone's account. Only moderators (maybe) and/or SE employees can (and probably in extremely small amount of scenarios that are well defined).