Silveira Freitas,40, was buried in somber ceremony in southern city of Porto Alegre where he was beaten to death by white security guards, sparking protests across the country.
Attorney General Raquel Dodge argued that delaying the former president's sentence for a corruption conviction would amount to a failure of the justice system.
The decision was the latest legal setback for da Silva, who was wildly popular as president in 2003-2010 but has since been dogged by corruption allegations amid a mushrooming graft scandal.
Dilma Rousseff – who was impeached in 2016 for breaking budget rules – said she believed believes her predecessor who himself was convicted of corruption can calm Brazil's stormy political waters.
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