Justine Damond, 40, was killed in what police confirmed was an “officer-involved shooting” in the city’s Fulton neighbourhood.
The Sydney woman had been living with her fiance and son in Minneapolis.
In a video shared online, Ms Damond’s stepson Zach Damond, 22, recounted what had happened on Saturday night before his stepmother called the police.
“I just know that she heard a sound in the alley, so she called the police, and the cops showed up,” he said.
“She was a very passionate woman, she probably, she thought something bad was happening, and next thing I know they take my best friend’s life.”
In the emotional video, Mr Damond went on to condemn police and demand answers over what happened.
“Basically my mum’s dead because a police officer shot her for reasons I don’t know,” he said.
“I demand answers. If anybody can help, just call police and demand answers. I’m so done with all this violence.
“America …