Defence lawyers in the US city of Minneapolis want charges dismissed against a former police officer who shot and killed Australian woman Justine Damond last year.

Lawyers for Mohamed Noor argue in motions filed on Wednesday that the charges should be dismissed because of prosecutorial misconduct and lack of probable cause.

Noor is charged with third-degree murder and second-degree manslaughter in the July 15, 2017, death of Damond. She was killed after calling police to report a possible assault.

Prosecutors say Noor was in a police car’s passenger seat when he shot Damond through the driver’s side window after she approached the vehicle.

Noor’s lawyers argue Hennepin County Attorney Mike Freeman’s statements about the case “have undermined Officer Noor’s fundamental right to a fair trial.”

-AAP