Mohamed Noor, 33, is charged in the July 2017 death of Justine Ruszczyk Damond in a case that drew international attention, cost the police chief her job and forced major revisions to the Police Department's policy on body cameras.

Prosecutors charged Noor with second-degree intentional murder, third-degree murder and second-degree manslaughter, saying there is no evidence Noor faced a threat that justified deadly force.

They must prove he acted unreasonably when he shot Ms Damond, a 40-year-old life coach with both US and Australian citizenship who was engaged to be married.

Noor's lawyers plan to argue that he used reasonable force and acted in self-defence.

Noor has refused to talk to investigators and his lawyers haven't said whether he will testify at his trial, which could last weeks. He did not respond to reporters' questions Monday as he and his lawyers arrived at the Hennepin County courthouse for the start of jury selection.

Potential jurors were expected to fill out forms in a half-day session.

Noor's partner that night, Officer Matthew Harrity, told investigators he was driving a police SUV when he heard a voice and a thump and caught a glimpse of someone outside his window.

Harrity said he was startled and thought his life was in danger. He said he then heard a noise and turned to see that Noor, in the passenger seat, had fired his gun past Harrity and hit Ms Damond through the driver's side window.

The officers did not turn on their body cameras until after the shooting, and there was no squad car video.

The lack of video was widely criticised, and Ms Damond's family called for changes, including when officers are required to turn on their cameras.

Days later, the Police Department strengthened its policy to require that the cameras be activated immediately when responding to a call or making a traffic stop.

The shooting also raised questions about the training of Noor, a Somali American whose arrival on the force about two years earlier had been celebrated by city leaders and Minnesota's large Somali community. Noor had previously worked in property management.

Documents later filed as part of the criminal case showed that training officers voiced concerns about Noor's fitness for duty long before he shot Ms Damond, but he was deemed fit to serve.

Judge Kathryn Quaintance ruled that prosecutors cannot present evidence about prior "bad acts" as a police officer.

She also said Noor's pre-employment psychological exam, which found that Noor was more likely than other officers to be impatient or have difficulty confronting people, cannot be used unless he testifies and it becomes relevant.

She also ruled his refusal to speak to investigators can't be used as evidence unless Noor takes the stand.

Australian Associated Press