The Minneapolis police chief, Janee Harteau, resigned on Friday at the mayor’s request, less than a week after one of the city’s officers fatally shot an unarmed Australian woman who had called 911 for help.

Mayor Betsy Hodges said in a statement that “I’ve lost confidence in the chief’s ability to lead us further” and that “it is clear that she has lost the confidence of the people of Minneapolis as well.”

The fatal shooting of the Australian, Justine Damond, last weekend by Officer Mohamed Noor led to outpourings of grief in Minnesota and outrage in Ms. Damond’s home country, where the prime minister has condemned the shooting and Ms. Damond’s family members have expressed frustration with how little they have been told about what happened.

Last Saturday, Ms. Damond, 40, called 911 twice to report a possible sexual assault near her home. Officer Noor and his partner, Officer Matthew Harrity, arrived at the scene in a dark alley several minutes later. Officer Harrity told state investigators that he had been startled by a loud noise just before Ms. Damond approached their cruiser. Officer Noor then shot her through the open window.

Officer Noor has declined to speak with investigators, and the authorities have provided no explanation for why he shot Ms. Damond. Neither Officer Noor nor his partner had turned on their body cameras.

 Chief Harteau, a 30-year veteran of the Minneapolis police force, said in a statement that “the recent incidents do not reflect the training and procedures we’ve developed as a department.”

“I’ve decided I am willing to step aside to let a fresh set of leadership eyes see what more can be done for the M.P.D. to be the very best it can be,” Chief Harteau said. “The city of Minneapolis deserves the very best.”