Alberto Granado, who accompanied fellow Argentine Ernesto 'Che' Guevara on a trip immortalised in the film The Motorcycle Diaries, has died in Cuba at the age of 88.
Cuban state media report said his ashes would be spread in Argentina, Cuba and Venezuela.
The famous trip across South America began in late 1951 on Mr Granado's old British motorcycle.
It is believed to have awakened in Guevara a sympathy for the poor and desire for social justice that turned him into a leftist revolutionary.
He was one of the leaders of Cuba's revolution that put Fidel Castro in power in 1959 and was in the Cuban government for several years until leaving to fight in other uprisings.
He died in Bolivia in 1967 while trying to start a rebel force there.
The Motorcycle Diaries was based on Guevara's diary of the trip and on Mr Granado's book Travelling with Che Guevara: The Making of a Revolutionary.
The 2004 film was directed by Brazilian Walter Salles.
At the invitation of his friend, Mr Granado, who was a biochemist, came to Cuba in 1961 and stayed.