In Mort, Albert, briefly returned to the world, summoned Death, who was having a holiday, to let him know that Mort, his apprentice, was doing a terrible job as replacement.
In Reaper Man, when Death had been forced to retire by the Auditors, an Auditor appeared in Death's place to inform the wizards about the situation when they attempted to ask him about the sudden abundance of life force, assuring them that 'normal service' would resume shortly.