At 10:30 a.m. Friday, jurors told Judge Leslie Ghiz they were deadlocked.
It is the second time a mistrial has been declared in the case of former University of Cincinnati campus police officer Ray Tensing who is accused of killing Sam DuBose in an incident tinged with the same overtones of racial discrimination and heavy-handed tactics as other recent high-profile USA police shooting cases. She also called for a third trial in the case.
Dozens of people demonstrated in steady rain outside the Hamilton County courthouse.
Civil rights campaigners and activists say the disproportionate number of black Americans killed by police is part of a broader pattern of racial discrimination in the country's justice system. Another University of Cincinnati police officer who witnessed the incident testified that he heard gunshots after the sound of tires screeching.
City Manager Harry Black adds the city respects people's right to protest, saying he expects any demonstrations to be peaceful.
"Tensing maintains he feared for his life as DuBose's auto began to drive away".
This is the second time the case has ended in a mistrial - the jury was deadlocked in the first trial, which ended last November. The prosecutor said, "Sam DuBose was trapped in that vehicle during that stop, and he was an easy target when his auto became his coffin".
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For a second time, a jury has been unable to agree on whether Ray Tensing was justified when he fatally shot Sam DuBose during a traffic stop.
DuBose was shot in the head.
To convict Tensing of murder, jurors had to find he purposely killed DuBose.
A mistrial has been declared in the case of a white OH police officer who was accused of shooting an unarmed black man.
Tensing, a 27-year-old officer with five years' experience, tried to open the Honda Accord's door. Hamilton County Prosecutor Joe Deters must now decide whether to seek a third trial. The trial ended without a verdict.
The shooting is among those across the nation that have raised attention to how police deal with blacks. Last week, a jury acquitted Minnesota officer Geronimo Yanez on charges stemming from shooting Philando Castile, who had indicated he had a legal firearm in his auto when he was stopped. Jurors told Ghiz, however, that they could not reach a unanimous verdict. The university police fired him after he was charged. This is the second mistrial of Tensing for this crime.
The circumstances in the DuBose, Castile, and Smith killings were suspicious enough that Tensing, Yanez, and Heaggan-Brown were all fired or asked to leave their departments.
Tensing said he thought about the fatal encounter "every moment for the last two years" during last week's appearance on the stand.