How did French playwright Jean Giraudoux die?  I know it was from
poison, but would like
some details!  Who did it?  Where? Why?  etc.

The German Wikipedia mentions "food poisoning"

I've later read the French wikipedia. They say, as the German one,
that it was food poisoning, but they add that some believe that the
Gestapo was responsible for the bad food.

Apparently Giraudoux's wife refused to have an autopsy and inquest, so
there may never be a definite answer.

Doctors thought Giraudoux's death (Paris, January 1944) was puzzling,
and  discussed the possibility of poisoning.

Louis Aragon published an article in Ce Soir saying the Gestapo had
poisoned Giraudoux. He was sure the playwright had been involved in
secret Resistance activity.

Food poisoning is often given as the reason for his death. (According
to some webpages: uremia due to botulism.)

At least two biographies discuss this question. See:
http://www.alapage.com/mx/?tp=F&type=1&l_isbn=2260000649&donnee_appel=GOOGL
http://www.parutions.com/pages/1-1-123-4886.html

The book review at the alapage site, originally published in Le Monde,
was my main source for this comment.