Michael Brown, 18, was killed in August 2014 by Officer Darren Wilson, sparking nationwide protests.
On March 4, the US justice department said it would not prosecute Darren Wilson in federal court.
It said it had found racial bias and illegal actions by Ferguson police.
“He did not have to kill Michael Brown,” lawyer Daryl Parks said of Darren Wilson.
The justice department report said police in the St Louis suburb of Ferguson overwhelmingly arrested and issued citations to black people to boost city revenues through fines and court fees.
That created a culture of distrust, the report concluded.
Demonstrators gathered outside the Ferguson Police Department on March 4 when the decision not to charge Darren Wilson was made.
In November, a St Louis County grand jury declined to charge Darren Wilson, who has since left the police department.
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