Khalil Lawal, 31, of Arlington, Virginia, was pronounced dead a few hours after the shooting.
It all began around 7:30 a.m. Monday near Broad and Bigler streets.
Investigators say Lawal apparently tried to use his black Honda to hit a person who had just gotten out of a car.
Then, on foot, Lawal chased another person who had tried to detain him, and then charged at the off-duty officer after he approached, leading to a violent struggle.
During the struggle, the officer fired about ten shots, hitting Lawal in the torso, legs, and face.
The detective suffered minor injuries and has been treated and released from the hospital.
The struggle between the suspect and the officer was caught on video, Commissioner Richard Ross said during a news conference late Monday.
However, he said he was concerned about the number of shots the detective fired.
The entire incident remains under investigation.
The Associated Press contributed to this report.
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