"The immediate thought that occurs is "how will they know you're dead?""
No, the obvious way to do that tends to be "no logins for X amount of time", ie. a "dead man's keyboard". The obvious problem being that any failure to remember the need to log in periodically would likely result in the deluge of nasty pranks you planned being unleashed while you're still alive, and the fact that even if the real likelihood of that would be low, simply living under the threat that it might happen accidentally would probably put you in an early grave, all by itself.