No longer in use or active, nor expected to be again.
No longer in business or service, nor expected to be again.
Specifically, of a process: having terminated but not having been reaped (by its parent or an inheritor), and thus still occupying a process slot. See also zombie, zombie process.
(of a language) No longer spoken.
To make defunct.
The dead person (referred to).
That has previously passed; past, bygone