Before upgrading to Mavericks, I had a "Sharing only" account called "Shared" with a password, which I used to allow other computers to connect to my Mac. However, since upgrading to Mavericks, this account no longer appears in the "Users & Groups" System Preferences pane. I believe this is because it conflicted with the built-in "Shared" folder in /Users/Shared, so Mavericks probably had trouble with this account when upgrading OS X.
However, the account itself still works, with my old password. Is there a way to delete this account, even if it doesn't appear in "Users & Groups", without deleting the /Users/Shared folder (which is separate; the folder is part of OS X, and my "Sharing only" account has no Home folder).