If this should happen to anyone again, only Pat and I, and the account holder can delete an account. I certainly wouldn't do it unless asked by the account holder, or after having notified you of a serious issue that couldn't be worked out.
However, I have closed accounts that have never logged in within a year since registration. I have only ever deleted 1 account that wasn't requested, and that individual was a foul-mouthed kid that was attacking our members and had a history of multiple bannings on PFF for the same reason.