I'm looking for a short, snappy alternative word/phrase meaning "person who has left the company".
I have very limited space available (20 characters) for a label that conveys (in prose):
List of tasks that are open but assigned to somebody who has left the company
I've tried Thesaurus.com but can't find anything graceful with this precise meaning. "Ex-staff" for example, is adequately short, but equally unpleasant.
Given our wonderful language's habit of a word for every occasion I'm surprised I'm finding nothing suitable!