About 100 people gathered in Red Arrow Park in downtown Milwaukee Tuesday night, to protest District Attorney John Chisholm's decision not to charge a police officer who shot and killed a man in April.
Officer Christopher Manney fatally shot Dontre Hamilton in the park, after a struggle with Manney's baton.
Family members say Hamilton suffered from schizophrenia.
Manney was fired from the police force in October, for failing to follow procedure during a pat-down of Hamilton.
Hamilton's brother Nate Tuesday night implored the crowd to keep the demonstrations peaceful.
"This doesn't have to be a violent approach, why? Because we really care about this city, everybody out here cares about the city, so tearing it down doesn't help," Hamilton says.
Federal authorities announced this week that they will look into the incident, to determine whether Manney violated Hamilton's civil rights.
