Justine Ruszczyk, 40, was shot on Saturday night by the police who were responding to her call about a possible assault.
After devoting much of her adulthood to enriching the lives of people in Sydney, Justine Damond took her teachings overseas.
They said a Minneapolis police officer fired his or her weapon, killing a woman. The BCA is now in charge of the investigation.
"I have questions about why the bodycams weren't on", she said in a press conference Sunday.
Minnesota Police have released few details of the circumstances of her shooting, except to say that the attending police officers' body cameras were not switched on at the time of the shooting and it was not captured by the officers' squad auto dash camera.
Around 200 people held a vigil outside her home following the shooting.
Local media say neighbours are mystified as to what occurred.
"Basically my mom was shot for reasons I don't know", he said, adding that woman called the police after she allegedly heard "a sound in the alley".
"I don't know anything about the law or police work to that extent but to me, it seems really stupid". "These cops need to get trained differently".
In Sydney, members of the Ruszczyk family said they were trying to come to terms with the tragedy "and to understand why this has happened".
"This is a very hard time for the Ruszczyk family", the statement read.
The Hennepin County Medical Examiner's Office is conducting an autopsy and will release more information through the BCA once the process is completed.
Friend Julie Reed remembered Damond, who used her fiance's last name ahead of their nuptials next month, for all the "joy she brought to our lives". She was a healer, she was loved. She was loved. And she should be alive.
"It was a hard decision for her to make", King said.
Justine Damond's stepson Zach Damond said in a Facebook video he released on Monday morning, that he "demands answers" from the police for what he described as unprovoked violence.
In St. Paul Sunday night, more than 50 people rallied on Grand Avenue and Dale Street to protest the 2016 fatal police shooting of Philando Castile.
Ms Monaghan said the "vibrant" Ms Damond moved to the United States to "follow her heart" and was living a "new life".
"I think it's a systemic thing", she said.
Australia's Department of Foreign Affairs and Trade (DFAT) said it is providing consular assistance to her family.
The Minnesota Public Safety Department earlier confirmed said a woman was shot after two officers responded to a callout about a possible assault.
A rally to demand more information about the woman's death was scheduled for 6 p.m. Sunday near the site of the shooting, organized through the Women's March Minnesota Facebook page. At some point, a weapon was sacked and a woman fatally shot.
Tributes from local community groups have also started flowing in.