She was 96.
An icon of glamour, Morgan was remembered for a regal azure gaze which she first turned on Jean Gabin as an 18-year-old ingenue in "Port of Shadows" ("Quai des Brumes"), a 1938 gangster movie.
"You've got lovely eyes, you know," he told her, forever sealing Morgan's fate in French filmography as the "most beautiful pair of eyes in cinema".
"It bothers me to hear that repeated so often", she was known to say much later -- though she still gave her 1977 memoirs the title "With eyes like that..."
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Claude Lelouch, who directed her in the 1975 "Cat and Mouse," paid tribute to her as "the one we all wanted to hold in our arms".
Morgan starred alongside Gabin, Jean Marais and Michel Simon, as well as Humphrey Bogart, and won her Cannes award in 1946 for her role as a blind woman in "La Symphonie Pastorale", Jean Delannoy's adaptation of an Andre Gide novel.
Her career flourished in the 1940s to 1960s, and faded with the arrival of New Wave cinema.
Born Simone Roussel in the Parisian suburb of Neuilly on February 29, 1920 -- a leap-year date which allowed her to joke that the could "age four times more slowly than everyone else" -- she spent most of her childhood in the Normandy port of Dieppe.
She left home at 15 in the hopes of reaching fame like American-Swedish actress Greta Garbo, entered drama school in Paris, and soon won a bit part in her first film, "Mademoiselle Mozart".
That was soon followed by her momentous encounter with Gabin, with whom she was to appear again in Jean Gremillon's "Remorque", released in 1942 during the German occupation of France.
Later that year Morgan left for the United States after marrying the American actor Bill Marshall.
There she made four films, playing opposite Frank Sinatra in "Higher and Higher" (1943) and Bogart in "Passage to Marseilles" (1944), director Michael Curtiz's unsuccessful attempt to repeat the Bogart-Bergman magic of "Casablanca".