A previous police press release said the man was shot when an unknown suspect fired shots at the crowd from a vehicle.
Subsequent investigations revealed that the unknown suspect fired at a vehicle around 11:30 pm. (12:30 am ET) and the occupants, including the victim, fled the vehicle.
The victim was shot at some point during the fight and then died in a hospital, the statement said.
Detroit is among the many US cities that have seen contentious overnight protests over the death of George Floyd, a black man, in the custody of the Minneapolis police. The police made dozens of arrests throughout the night.
Detroit police cannot confirm whether the victim was part of the protests, but the shooting took place in the center of the city, where the protests were taking place. Detroit police are investigating.
Earlier, Detroit police chief James Craig said a person had been arrested after trying to run over a police officer. A commanding officer was hit by a rock thrown by a protester and taken to the hospital.
Many of the prisoners are not residents of the city of Detroit, Craig said.
"I am not going to stand still and let a small minority of criminals come in here, attack our police and make our community insecure. Just know, we will not tolerate this," said Craig.