She approached the driver's side door and started talking to the driver.
The Star Tribune quoted three sources which it did not name as saying Justine Damond was in her pyjamas when a police vehicle responding to a 911 call pulled into the alley.
The below Facebook video shows 22-year-old Zach Damond, son of 50-year-old Don, speaking about Justine - a woman he called his best friend.
Mr. Omo, who is from IN, said Ms. Damond moved to the United States about three years ago because her fiancé could not move to Australia with his son and work.
The younger Damond said Justine Damond called 911 after she "heard a sound in the alley" behind her home. "I'm so done with all this violence", he said.
Minneapolis Mayor Betsy Hodges told a news conference at City Hall late on Sunday: "I am heartsick and deeply disturbed by the fatal officer-involved shooting that happened last night".
"There are questions like, 'why weren't their body camera's on?"
Investigators with the Bureau of Criminal Apprehension (BCA) said that at around 11:30 p.m. Saturday, a 911 call was made about a possible assault in the area.
Both Hodges and Arradondo said they are not releasing the victim's name and said that information will later come from the BCA.
Australian woman shot and killed by police officer in Minneapolis
According to the BCA, two Minneapolis police officers were responding to an assault report at the time.
"Yeah I wanted to do something", Lisa Ganser said.
The site's bio for Justine also claimed she "is a qualified yoga instructor, a personal health & life coach (EFT, Theta and Re-connective Healing practitioner) and meditation teacher". The incident is under investigation.
My thoughts are now with everyone affected by this tragic incident, especially the deceased woman and her family.
The Australian Department of Foreign Affairs (DFAT) has confirmed the death this morning AEST time.
After an hour of her death, hundreds of women gathered outside the Damond home to hold a vigil for the woman.
The Hennepin County Medical Examiner's Office has not yet released the woman's identity.
Damond is believed to have been living in the U.S. for at least the past three years.
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. There are so many people that would talk about her in the same way.
"Basically my mum was shot for reasons I don't know", her stepson Zac said in a video posted to Facebook.More news: Netanyahu departs for 5-day trip to France and Hungary