A prosecutor has criticised a former Minneapolis police officer for his decision to shoot an unarmed Australian life coach Justine Ruszczyk Damond, suggesting he had "no basis" to fire when he couldn't see a weapon or her hands.
Prosecutor Amy Sweasy pressed Mohamed Noor to explain why he didn't choose another option before he shot Damond in July 2017, just minutes after she called 911 to report a possible sexual assault in the alley behind her house.
Sweasy asked Noor, 33, why he couldn't have told Damond to step back, tell his partner to drive, or tell his partner to get down.
"I had to make a split-second decision." Noor testified, and said he felt he had no other choice but to shoot in the moments after a "loud bang" on his squad car made him fear a possible ambush.
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Noor's testimony came near the end of the fourth week in his trial on murder and manslaughter charges in the death of Damond, 40.
His lawyers have argued that he was justified in using deadly force to protect himself and partner Matthew Harrity from a perceived threat.
Prosecutors have argued there was no reasonable threat, and questioned whether the supposed bang on the squad car was invented.
Sweasy reminded Noor of testimony on Thursday in which he said reacting too late to a threat means officers can die.
"It's also true if you don't do your job correctly, someone else could get killed," Sweasy said.
Noor's lawyer, Thomas Plunkett, asked Noor what would have happened if the person approaching the squad car had had a weapon.
"My partner would have been killed," Noor answered.
Noor's testimony on Friday lasted barely an hour. It came a day after he took the stand in his own defence and for the first time publicly talked about the night of Damond's death. Noor had refused to talk to investigators since the shooting.
He described his training in various police skills including "counter-ambush" training that included scenarios such as two officers in a squad car, doing routine tasks, and an instructor yelling "Threat!" The officers had to make a quick decision about whether to shoot, Noor said.
Emanuel Kapelsohn, a use-of-force expert, testified for the defence on Friday that he felt Noor used reasonable force given the totality of the circumstances.
"He had to react immediately," Kapelsohn said.
Two other use-of-force experts testified for the prosecution earlier that they felt Noor did not act reasonably.
The death of Damond, who was engaged to be married a month after the shooting, sparked outrage in both the US and Australia, cost Minneapolis' police chief her job and contributed to the electoral defeat of the city's mayor a few months later.
Noor has pleaded not guilty to charges of third-degree murder and second-degree manslaughter, which carry respective penalties of up to 25 and 10 years in prison.
Damond's family filed a civil lawsuit against the city and several police officers last year seeking US$50 million in damages.