But the case still came down to jurors' assessment of whether Noor was justified in shooting, and they had only the officers' testimony for a picture of the key moments.
"This is the first time, in the state of Minnesota, that a police officer has ever been convicted of an on duty killing", she said.
Ms Damond Ruszczyk had called 911 just minutes before she was shot to report a possible sexual assault in the alley behind her home.
The jury of ten men and two women acquitted Noor on an additional count of second-degree murder in the killing. Yanez then pulled out his gun and began shooting Castile, as his girlfriend and her 4-year-old daughter sat in the auto. Noor said he and his partner heard a loud noise and feared an ambush before he shot Damond, a dual citizen of the USA and Australia.
The shooting cast a harsh spotlight on the Minneapolis Police Department and the state Bureau of Criminal Apprehension for its handling of the investigation, culminating in the resignation of Minneapolis' police chief and a change in the department's body camera policy.
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Prosecutors questioned whether the bang happened and attacked Noor for not seeing a weapon or Damond's hands before he fired.
He said he believed there was an imminent threat after he heard a loud bang and saw Ms Damond with her right arm raised.
A wave of killings of black men and teens by US police prompted street protests with this case providing a mirror image since Damond was white and Noor is a black Somali immigrant.
Noor repeatedly testified that he feared for his partner's life.
Noor was taken into custody straight after the verdicts were read just after 5pm (local time).
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Now that the trial's over, the family may continue with its lawsuit against Noor, his partner Harrity, former Minneapolis Police Chief Janee Harteau, current Chief Medaria Arradondo and the city of Minneapolis.
The defendant said he "had to make a split-second decision" and shot Ms Damond through the vehicle window.
Harrity spoke of the fears police officers confront daily and the mental agony he suffered in the shooting's aftermath. Sentencing is scheduled for June 7.
Longtime prosecutor Steve Schleicher said disagreements between the county attorney's office and police during a case are common, but those disputes are often kept private.
In an email to 5 EYEWITNESS NEWS, Minneapolis Police Officers Federation president Lt.
Under the law of Minnesota, third-degree murder is fatally hurting someone without the intent to kill and "without regard for human life".
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Noor was sacked after he was charged. They deliberated roughly 11 hours before reaching a decision. Noor testified that he fired to protect Harrity, his partner.