Justine Damond was shot dead by police in Minneapolis. Photograph: LinkedIn/ AAP
The woman has been named as Justine Damond, who ran meditation workshops at the Lake Harriet Spiritual Community.
Her stepson, Zac Damond, said she had called police after hearing a noise near her house.
Two Minneapolis police officers responded to a 911 call of a possible assault just north of the 5100 block of Washburn Avenue S just before 11.30 pm Saturday, the country Bureau of Criminal Apprehension said in a statement, according to the Star Tribune. At one point, an officer fired their weapon, fatally striking a woman.
The BCAs investigation is in its early stages. More info will be available once initial interviews with incident participants and any witnesses are complete The officers body cameras were not turned on at the time and the squad camera did not capture the incident. Examiners are attempting to determine whether any video of the incident exists.
The two officers involved are on paid administrative leave.
Her stepson told Damond, an Australian in her 40 s, was passionate and his best friend.
Basically my mum was shot for reasons I dont know, he said in a video positioned on Facebook on Monday morning.
I just know she heard a audio in the alley so then she called the police and the cops showed up and she was a very passionate woman, she likely thought something bad was happening and then next thing I know they take my best friends life.
The mayor of Minneapolis, Betsy Hodges, said she intended to find out why the officers body cameras were not turned on.
As mayor of our city, a wife, and a grandmother, I am heartsick and deep disturbed by what occurred last night, she posted on Facebook.
Damond is believed to have been living in the US for at the least the past three years. Her personal website says she developed as a veterinarian and practised yoga and meditation for 17 years.
The Australian Department of Foreign Affairs and Trade tells it is providing consular support to the family of an Australian girl killed in the US.