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. He was 68.
Mr. Castro Díaz-Balart, who had been treated for a deep depression for several months, committed suicide, according to a report in the newspaper Granma. He had been undergoing outpatient treatment after being hospitalized.
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.
At the time of his death, he was a science adviser to Cuba’s Council of State and vice president of the Academy of Sciences of Cuba.
Mr. Castro Díaz-Balart played a prominent role in efforts to develop nuclear energy on the island. He was the executive secretary of Cuba’s Atomic Energy Commission from 1980 to 1992 and was in charge of a project to build a nuclear power plant at Juraguá.