The joint suicide of André Gorz, the French philosopher and founder of the magazine Le Nouvel Observateur, and his British-born wife Dorine, who was suffering from a fatal disease, has turned the love letter that he wrote to her into a surprise bestseller.

Gorz, 84, a friend of Jean-Paul Sartre, and Dorine, 83, committed suicide by lethal injection at their home in the village of Vosnon, east of Paris, on September 22. Two days later a friend found them lying side-by-side in their bedroom.

Gorz’s 75-page Lettre à D. Histoire d’un Amour (Letter to D. Story of a Love), published a year earlier, was a tribute to his wife. One French critic described the work, which won him a wider audience than his essays on ecology and anti-capitalism, as his “intellectual and emotional testament”.

The couple met by chance at a card game in 1947 and married in 1949. “You will soon be 82. You have shrunk six centimetres and you weigh just 45 kilos and you are still beautiful, gracious and desirable,” the book starts. “It is now 58 years that we have lived together and I love you more than ever.”

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