If a Facebook user dies, what happens to their Facebook account? Is it deleted after a certain period? Should their friends or relatives inform Facebook that they are dead?
What happens to your Facebook account when you die?
facebook;account management
You can report this to Facebook requesting that they remove the account or memorialize the account.From Facebook FAQ:How do I report a deceased user or an account that needs to be  memorialized and deactivated or  deleted? Memorializing the account:Please report this information here so  that we can memorialize this persons  account. Memorializing the account  restricts profile access to confirmed  friends only. Please note that in  order to protect the privacy of the  deceased user, we cannot provide login  information for the account to anyone.  We do honor requests from close family  members to close the account  completely.Removing the account: Immediate family  members may request the removal of a  loved ones account. This will  completely remove the account from  Facebook so that no one can view it.  We will not restore the account or  provide information on its content  unless required by law. If you are  requesting a removal and are not an  immediate family member of the  deceased, your request will not be  processed, but the account will be  memorialized. To make a request to memorialize or  remove a profile, please do so here.  If you have a special request  regarding a deceased user's account,  please use this form. Please note that  this form is only to be used for  accounts that have already been  memorialized.The Facebook FAQ page can be found here