@abc.abstractmethod<EOL><INDENT>def register_for_deleted_agent(self, agent_id):<DEDENT>
pass<EOL>
Registers for notification of a deleted agent.

        ``AgentReceiver.deletedAgents()`` is invoked when the specified
        agent is removed from this agency.

        :param agent_id: the ``Id`` of the ``Agent`` to monitor
        :type agent_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``agent_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*