Alberto Nisman, 51, was buried in a Jewish cemetery on the outskirts of Buenos Aires near several of the victims who died in the 1994 bombing of a Jewish charity known as AMIA.
Nisman had spent the last 14 years of his life trying to unravel who carried out the horrific attack, which killed 85 people and injured another 300.
But on January 18, one day before he was to have appeared before a congressional panel to present evidence in the case, Nisman was found dead at his home of a single bullet wound to the head.
At his funeral, hundreds of protesters, convinced that he was a victim of foul play, gathered in front of the cemetery, some holding placards demanding "Justice for Nisman."
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"It is a great injustice. He was threatened," said Cristina Paredes, 53, who said Nisman's death "is the straw the broke the camel's back" for Argentines fed up with Kirchner and accusations of corruption by her administration.
The death was mourned as far away as Israel, which hailed Nisman -- son of a textile merchant who had studied law at the University of Buenos Aires -- as "courageous."