Authorities said two police officers responded to a 911 call of a possible assault just before 11:30 pm on Saturday night.
"I demand answers." The Star Tribune quoted three sources which it did not name as saying Damond was in her pajamas when a police auto responding to her 911 call pulled into the alley.
Questions remain about the circumstances that lead to Damond's death, especially because the officers who shot her had their body cams turned off at the time. At some point, Noor, who was in the squad's passenger seat, reached over and shot Damond.
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". The officers' body cameras were not activated during the incident, authorities said.
All Minneapolis police officers have worn body cameras since the end of 2016, according to the city, a policy decision that was announced in July 2016, same month a black motorist named Philando Castile was fatally shot by a police officer in the Twin Cities area.
Ruszczyk was originally from Australia, though she was a U.S. citizen because her father holds USA citizenship, the source who knew her said.More news: State police release drawing of suspect in Delphi killings
"Sadly we now [mourn the life of] Justine, a white woman living in southwest Minneapolis, who simply notified the police about an assault she was concerned about", Michelle Gross of Communities United Against Police Brutality said.
"I demand answers. If anybody can help, just call the police and demand answers".
A man claiming to be Damond's son said in a Facebook video that she's the one who called 911 after hearing a noise in the alley near their home. We will not make any further comment or statement and ask that you respect our privacy.
The medical examiner's office will be conducting an autopsy.
"She thought there was something bad that was happening and next thing I know, they take my best friend's life".More news: Huawei teams up with KFC to release a new smartphone
Justine was preparing to marry Don, and the well-liked woman began to use the name Justine Damond.
One woman, identified only as Bethany from Women's March Minnesota, said she lived in the neighbourhood and described Ms Ruszczyk as a "beautiful light".
"She and Don were just so in love", the friend said.
Local residents held a vigil over the weekend where hundreds gathered to remember the woman and call for police reform, KSTP reports.
"There are still many questions about what took place, and while the investigation is still in its early stages, I am asking the BCA to release as much information, as quickly as they are able to", she added.
A Department of Foreign Affairs and Trade spokesperson says consular assistance is being offered to the family involved.More news: Romania's tennis ace Simona Halep, one win away from world No.1