Cathi, I'm sorry for your loss. You need to write to info @ wikitree.com (without the spaces) and tell them. If you just remove his email address, that's not a good idea because it will leave all his profiles in limbo somewhere - I don't know if he'd be removed as manager of them and if there are any private or living profiles they need special attention. They will also place a sticker on his profile, honoring him as a former member.