HAVANA, Feb 1 (Reuters) - The eldest son of late Cuban revolutionary leader Fidel Castro, Fidel Castro Diaz-Balart, committed suicide on Thursday after being treated for months for depression, Cuban state-run media reported.
"Diaz-Balart, who had been attended by a group of doctors for several months due to a state of profound depression, committed suicide this morning," Cubadebate website said.
Fidel Castro Diaz Balart, son of former Cuban leader Fidel Castro
Fidel Castro Diaz Balart, son of former Cuban leader Fidel Castro
Fidel Castro Diaz Balart, son of former Cuban leader Fidel Castro, attends the presentation of a book based on a recent meeting of Fidel Castro with writers from over 22 countries in Havana March 14, 2012. The book, titled 'Our Duty is to Fight', was presented simultaneously in 10 countries. REUTERS/Desmond Boylan (CUBA - Tags: POLITICS SOCIETY)
(FILES) This files photo dated February 2002 of Castro's elder son, nuclear physicist Fidel Castro Diaz-Balart (R), during the Havana Book Fair opening. Cuban media have interviewed recently some of Castro's eight sons, who are still unknown by most Cubans, without mentioning their father. AFP PHOTO/Adalberto ROQUE (NOTE: Goes with article 'Fidel's intimacy unveiled', by Carlos Diaz.) (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
Fidel Castro Diaz-Balart, son of former Cuban leader Fidel Castro, (R), poses beside heiress Paris Hilton as she takes a selfie during the gala dinner of the closing of the XVII Habanos Festival in Havana, February 27, 2015. REUTERS/Alexandre Meneghini (CUBA - Tags: BUSINESS ENTERTAINMENT POLITICS TPX IMAGES OF THE DAY)
HAVANA - JANUARY 8: Fidel Castro Diaz-balart (2nd from right) son of Cuba's ailing Revolution leader Fidel Castro, during a political act to commemorate the arrival of the so-called victory caravan, re-enacting the triumphal 1959 entry into Havana by Cubas Revolution leader Fidel Castro and his rebels, exactly 50 years later, on January 8, 2009, in Havana, Cuba. Fidel Castro, who ruled as Cuba's President since coming to victory in 1959 until two years ago, when illness forced him to hand over power to his younger brother Raul Castro, remained behind the scenes during the celebrations of the 50th anniversary of the Revolution. 2nd from left is General Harry Villegas, aka Pombo, one of the few survivors of Che Guevara's guerriila in Bolivia. (Photo by Sven Creutzmann/Mambo Photo/Getty Images)
Fidel Castro Diaz Balart, son of Cuba's former leader Fidel Castro, attends the the inauguration of the International Book Fair in Havana February 9, 2012. REUTERS/Enrique De La Osa (CUBA - Tags: POLITICS HEADSHOT)
Fidel Castro Diaz-Balart, son of Cuba's President Fidel Castro, talks to Argentine human right activist and member of the Mothers of the Plaza de Mayo group Hebe de Bonafini during the inauguration of the International Book Fair in Havana February 8, 2007. REUTERS/Claudia Daut (CUBA)
Fidel Castro Diaz Balart, son of Cuba's President Fidel Castro, arrivals for the opening ceremony of Valdivia's new Scientific Studies Center in Valdivia city, some 839 km (521 miles) south of Santiago, January 13, 2007. REUTERS/Jose Luis Saavedra (CHILE)
Fidel Castro Diaz Balart (R), son of Cuba's President Fidel Castro, and Pablo Guayasamin, son of late Ecuadorean painter Oswaldo Guayasamin stand together at the Fine Arts Museum in Havana December 1, 2006. REUTERS/Enrique De La Osa (CUBA)
[Fidel] Castro's son Fidel Angel Castro Diaz-Balart, known also as "Fidelito" is seen attending May Day commemorations at Revolution Square May 1, 2004.
Fidel Castro Diaz Balart, son of Cuban leader Fidel Castro, attends a meeting at the Convention Center in Havana in this February 11, 2005 file photo. Castro's family has not been immune to the political rift his left-wing rule has caused among Cubans since his 1959 revolution. Castro's six sons live in Cuba and support their father's government from a second-row position, increasingly showing up at public events. But other members of the family live abroad, from where they often make a living by spewing vitriol. REUTERS/Claudia Daut/Files (CUBA)
Fidel Castro Diaz-Balart, son of former Cuban president Fidel Castro, participates in the inauguration of the 32nd Havana International Fair (FIHAV) on November 2, 2014. About two thousand businessmen from 60 countries participate in this edition of the mayor commercial fair of the island, which will take place until November 8. AFP PHOTO/ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
Fidel Castro Diaz-Balart, son of Cuban ailing president Fidel Castro attend a meeting in Havana, 28 January 2008, to celebrate the 150th Anniversary of the birth of Cuban National hero Jose Marti. AFP PHOTO/ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
Fidel Castro Diaz-Balart, son of former Cuban President Fidel Castro, presents two books of his about technology and science at the XIX International Book Fair in Havana on February 12, 2009. AFP PHOTO/STR (Photo credit should read STR/AFP/Getty Images)
Dr. Fidel Castro Diaz Balart, son of cuban president Fidel Castro, talks to the media during the presentation of his book 'Amanecer del Tercer Milenio' (Sunrise of the Third Millenium), 02 December 2002, In Guadalajara, Mexico. The presentation was part of the 'Feria Internacional del Libro' in the Jalisco state. AFP PHOTO/Hector GUERRERO (Photo credit should read HECTOR GUERRERO/AFP/Getty Images)
Fidel Castro Diaz-Balart (L), oldest son of Cuban President Fidel Castro, speaks with presidential aid Carlos Valenciaga 09 February, 2000, in Havana, during a rally demanding the return of Elian Gonzalez to Cuba. Elian, 6, was rescued off the Florida coast November, 1999, and has been living with his Miami family, as the US and Cuban governments argue his fate. (ELECTRONIC IMAGE) (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
The son of late Cuban leader Fidel Castro, Fidel Castro Diaz-Balart (C) looks the urn with the ashes of his father, at the Parque Cespedes in Santiago de Cuba, on December 2, 2016
The convoy carrying the ashes of Cuba's late communist leader Fidel Castro ends an island-wide journey on Saturday in the cradle of his revolution for a big ceremony before his burial. / AFP / RONALDO SCHEMIDT (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)
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Castro, 68, also known as "Fidelito" because of how much he looked like his father, had initially been hospitalized for depression and then continued treatment outside of hospital.
A nuclear physicist who studied in the former Soviet Union, he had been working as a scientific counselor to the Cuban Council of State and Vice-president of the Cuban Academy of Sciences at the time of his death.
His father, who built a communist state on the doorstep of the United States during the Cold War, died just over a year ago, on Nov. 26, 2016, aged 90.
(Reporting by Sarah Marsh and Marc Frank; Editing by Sandra Maler and Grant McCool)