Tunisian dissident Zouhair Yahyaoui - who founded and ran satirical website TuneZine - has died at the age of 36.
In 2002, Yahyaoui was imprisoned for 'spreading false news'
Relatives said he died in hospital of a heart attack, where he was taken after complaining of chest pains.
Zouhair Yahyaoui was imprisoned for 18 months in 2002, after he published opposition material on his site.
Many tributes have appeared on opposition websites. He won the 2003 cyber-freedom prize set up by media rights group Reporters Without Borders.
Zouhair Yahyaoui was arrested in a cyber cafe and sentenced to two years imprisonment for "spreading false news".
He went on hunger strike a number of times and supporters claimed he was tortured.
He was given a conditional release in November 2003.
Correspondents say Tunisia has one of the world's most sophisticated systems of internet censorship.