Arizona prosecutors said Tuesday that they had not found evidence to charge Uber with a crime in connection with an accident in which one of its autonomous cars hit and killed a pedestrian in Tempe a year ago.

On March 18, 2018, a Volvo sport utility vehicle, one of several self-driving vehicles that Uber was testing, was traveling about 40 miles per hour when it hit Elaine Herzberg, 49, as she was walking her bicycle across the street at night, the authorities said.

While the car was in autonomous mode, a safety driver was sitting in the driver’s seat.

The Yavapai County Attorney’s Office, which reviewed the case, said in a letter dated Monday that there was “no basis for criminal liability for the Uber corporation.”

But it added that investigators should look into what the safety driver “would or should have seen that night given the vehicle’s speed, lighting conditions, and other relevant factors.”