0331 GMT May 17, 2021
Chief Tim Gannon and Officer Kim Potter have quit the Brooklyn Center force, BBC reported.
Potter said she shot Daunte Wright accidentally, having mistakenly drawn her gun instead of her Taser, a stance backed by Gannon.
Despite the resignations fresh clashes between police and protesters erupted for a third night on Tuesday.
Wright's mother has been speaking about her last phone call to her son. In tears, she told reporters she could never have imagined he would be killed.
The death happened in a suburb of Minneapolis, a city already on edge amid the trial of a white ex-police officer accused of murdering African American George Floyd.
On Tuesday night bottles and other projectiles were thrown at the Brooklyn Center police headquarters and officers responded by firing tear gas, stun grenades and rubber bullets.
More than 60 people were arrested, Minnesota State Patrol Colonel Matt Langer told reporters.
Another demonstration broke out in Portland, Oregon, on Tuesday night, with about 100 protesters marching on the Portland Police Association Building.
Flames were seen coming out of the side of the police building about an hour later. The Portland Police Bureau declared the gathering a riot.
Portland was the center of mass demonstrations last year, in the wake of the killing of George Floyd.
Several hours after officer fatally shot Daunte, looters targeted as many as 20 stores around the Shingle Creek Crossing shopping mall area two miles away.
National Guard troops arrived just before midnight as looters targeted the Brooklyn Center Walmart and nearby shopping mall. Several businesses around the Walmart were completely destroyed, including Foot Locker, T Mobile, and a New York men's clothing store.
Looting was widespread late Sunday into early Monday, spilling into north and south Minneapolis. Reports said that stores in Uptown and along Lake Street were also being looted.
Brooklyn Center Mayor Mike Elliott issued a curfew order until 6 a.m. Monday. Precautions were being taken into Monday, with Brooklyn Center canceling or closing all school buildings, programs and activities.