As he opens the door and tries to get into the driver's seat one of the officers pulls on his T-shirt and he appears to be shot repeatedly in the back.
Civil rights attorney Ben Crump said Blake's three sons were in the car at the time and he had been trying to break up a fight between two women.
"They saw a cop shoot their father. They will be traumatized forever," Crump said on Twitter.
Crump represents the family of George Floyd, a black man who died on May 25 when a white police officer knelt on his neck for nearly nine minutes.
After nightfall in Kenosha, a crowd of protestors faced off against riot police, according to footage posted by the Milwaukee Journal Sentinel.
Kenosha city later declared an overnight curfew.
Wisconsin Department of Justice said its criminal investigation division was investigating the shooting.
"The involved officers have been placed on administrative leave," it said in a statement early Monday.
The death of Floyd ignited massive nationwide protests against racism and police brutality.
(Writers & Editors: BUR-MTP/LEG, Agence France-Presse)
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