Wiktionary
no longer with us
a. 1 (context euphemistic English) dead; deceased. 2 Not still employed at a company, of someone who left or was let go.
Usage examples of "no longer with us".
All creatures who did not use their theorem are no longer with us.
He became a fixture in half-a-dozen magazines of the time-some of them no longer with us-and shortly was joined by a number of other by-lines, attached to much the same sort of wry and colorful story.
However, as you have pointed out, there is no way at this time to be certain that the source of Captain Chandler's and Ensign Stepanovich's irrational behavior is indeed no longer with us.