The family of Australian-American woman Justine Damond Ruszczyk, who was shot dead by a US police officer, say they are concerned authorities did not adequately investigate the circumstances surrounding her death.
Ms Damond Ruszczyk's father John said he had heard Minneapolis' Hennepin County Attorney believed investigators had not carried out a thorough investigation.
"We are deeply concerned about the possibility that the initial investigation was not done properly and with the greatest integrity or a sense of completeness," Mr Ruszczyk told reporters in Sydney.
"James Baldwin (American writer and social critic) once said, 'It is certain in any case that ignorance, allied with power, is the most ferocious enemy justice can have'.
"That is particularly true when it comes to evaluating the use of deadly force by those sworn to protect us. Ignorance cannot prevail here."
Minneapolis Police Officer Mohamed Noor fatally shot Ms Damond Ruszczyk after she called 911 about a possible sexual assault in the laneway behind her house on July 15.
The Minneapolis police chief, Janee Harteau, resigned after not immediately returning from holidays following Ms Damond's death.
A statement from the city said Chief Harteau quit at the request of Mayor Betsy Hodges.
"I've lost confidence in the chief's ability to lead us further - and from the many conversations I've had with people around our city, especially this week, it is clear that she has lost the confidence of the people of Minneapolis as well," Ms Hodges had said in a statement.
Ms Hodges was not immune to criticism either, with protesters calling on her to resign at a press conference held a week later.
Minneapolis' top prosecutor Mike Freeman said last week he did not have enough evidence to charge Officer Noor.
Mr Freeman previously said he expected to make a decision on whether to charge him before the end of the year.
In a video posted to Facebook, Mr Freeman is seen telling attendants of the Minneapolis Regional Labor Federation holiday reception the investigators "haven't done their job".
"I've got to have the evidence. And I don't have it yet. And let me just say, it's not my fault," he said.
Mr Freeman did not name the investigators of the case, however Minnesota's Bureau of Criminal Apprehension (BCA) is heading the investigation.
"I want to publicly apologise to the Minnesota Bureau of Criminal Apprehension. I was wrong to discuss the agency's work on the Justine Damond case in a public setting," Mr Freeman said.
While he said he did not know he was being recorded, "nonetheless, my comments, under any circumstances, were ill-advised and I am sorry".
"While some clamour for swift justice, only careful, detailed work and careful analysis brings us real justice," Mr Freeman said on Monday.
"That is what this case deserves and that is what it will get."
Mr Ruszczyk said while Mr Freeman apologised "for where, when and how he made those comments ... he does not say that his comments about the BCA investigation itself were unfounded, inaccurate or in any way untrue".
"At the least, Mr Freeman's comments cast doubt on the description of how Justine's death occurred as it was initially put out by the BCA and the attorney for the officer driving the squad car," he said.
Ms Damond's family has engaged US lawyer Robert Bennett to run a civil case in 2018, according to Australian Story.
The case will be brought under section 183 of the US Civil Rights Act and will claim Officer Noor used excessive force, resulting in the wrongful loss of Justine's life.
