Fidel Castro’s Eldest Son Commits Suicide, Cuban Media Says Bearing a close resemblance to his father, Mr. Castro Díaz-Balart, known as Fidelito, was the only son of the president and his first wife, Mirta Díaz-Balart. 1, 2018 MEXICO CITY — Fidel Ángel Castro Díaz-Balart, a nuclear physicist who was the oldest son of former Cuban President Fidel Castro, died on Thursday, Cuban state media reported. In a second interview with RT, also in 2013, Mr. Castro Díaz-Balart said when he had studied in the Soviet Union he used an assumed name and that few people knew who he was. Mr. Castro Díaz-Balart remained a champion of nuclear energy, making the case for its growth in developing countries in a 2002 essay in the International Atomic Energy Agency Bulletin. Mr. Castro Díaz-Balart led Cuban delegations at conferences around the world, including the March 2016 meeting of the American Physical Society, where he spoke on physics in Cuba. Mr. Castro Díaz-Balart played a prominent role in efforts to develop nuclear energy on the island.
