His brother, Raul Castro, released a statement saying...
"The commander in chief of the Cuban revolution died at 22:29 hours this evening"
Castro told the nation in an unexpected late night broadcast on state television that Fidel Castro had died and would be cremated on Saturday ending the announcement by shouting the revolutionary slogan "Towards victory, always!"
Fidel Castro had essentially been retired from political life for some time.
Castro temporarily handed over power to his brother in 2006 as he was recovering from an acute intestinal ailment. His brother Raul officially became president two years later.
In his final years Fidel Castro wrote newspaper commentaries on world affairs and occasionally met with foreign leaders but ultimately lived in semi-seclusion.
Castro was the longest serving non-royal leader of the 20th Century.
Fidel Castro ruled Cuba as a one-party state for almost 50 years before Raul took over in 2008.
With Raul Castro having already said he will step down in 2018 many believe it is likely that Cuba will entirely abandon communism altogether.