Why not have a special "unmemorialize" button when the account is logged in? Either the person is really dead, in which case the user logging in is probably in charge of managing the remembrance and would not press the button, or the person is not dead and he/she is logging into their own account, which has been pranked.
Or, someone hacked the account. Identity theft of a deceased person is more disturbing than of a live individual - just imagine how friends of that person would feel if the account would start broadcasting that its owner is still alive.
Why involve support here at all?