Cause of death: heart attack
Germaine Alice Coty (French pronunciation: [ʒɛʁmɛn kɔti]; née Corblet; 9 April 1887 – 11 November 1955) was the daughter of a Normandy ship owner who became the wife of the French lawyer-politician René Coty. When she died, slightly less than 22 months after her husband became president of France, she became the first wife of a French president to die while her husband was still in office. By that time she had become popular with the French public "for her simplicity and kindness: hostile commentators who had mocked her when she moved into the presidential "Élysée Palace" quickly ceased their mockery in response to vehement public protests".
Source : Wikipedia