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Sanche de Gramont, who inherited his father’s title, grew up between American and French identities.

Ted Morgan preferred McDonald’s hamburgers and California wines to Sanche de Gramont’s coq au vin and French vintages.

His father, Count Gabriel Antoine Armand de Gramont, had moved temporarily from Paris and sold luxurious Bugatti automobiles in Geneva while preparing for his entrance exams for the French diplomatic service.

The cause was complications of dementia, his daughter, Amber de Gramont, said.

Mr. Morgan, who at the time was still writing as Sanche de Gramont, rushed to the opera house and quickly pieced together a detailed account of the tragedy.