The Sacramento Bee reported that the officer was shot close to 5th and D Streets as she responded to an accident involving three cars at about 7 p.m.
"At this point", Davis police Chief Darren Pytel said at a Friday news conference, "we're speculating that [Officer Corona] never saw him". The Sacramento County Sheriff's Department has taken over as the lead agency in the investigation. Shell casings were found all over the street. The suspect was not part of the initial accident, officials said.
"Despite the valiant efforts of paramedics who rushed her to the hospital, and UC Davis Medical Center personnel, she succumbed to her injuries".
Police have not named the suspect, who was found in a house near the shooting, nor determined what prompted the shooting.
They said it happened in downtown Davis and a suspect is still outstanding.
Corona began as a part-time employee in the Davis Police Department in 2016.
"That's a very hard detail for the officers, but something that's very important to us", Pytel said, adding that chaplains and trauma-support counselors have been enlisted to help Corona's grieving colleagues.
"I gave [Corona] my license and she was just about to give it to me".
A photograph published by the Williams Pioneer Review shows her father, Merced Corona, pinning her badge at her swearing-in ceremony in August.
Natalie Corona, 22, was the second female rookie police officer to be shot dead in the last two days.
"She was the best of us", said Davis officer Mike Yu, after placing a "Blue Lives Matter" flag at the crime scene, about a mile from the police station.
The chief said he spent time Friday afternoon with Corona's family, who are faring "remarkably well under the circumstances".
Her father, Merced Coronoa, is a retired 26-year veteran deputy with the Colusa County Sheriff's Office, who is is now a county supervisor.
Stone has called Davis home for most of her life. She is also survived by her mother, Lupe, and sister, Jackie.
A man was seen walking holding a black and grey American flag, outside UC Davis Medical Center in honor of a Davis police officer who was killed in the line of duty. "And just very sorry for the family". 'She just worked like you can't believe'.
Gov. Gavin Newsom is ordering state Capitol flags flown at half-staff for a 22-year-old police officer who was fatally shot in northern California by a suspect who later died of a self-inflicted gunshot wound.
Her death follows the killing of a central California officer on December 26 during a traffic stop.
Gustavo Arriaga Perez, also 33, was charged with the murder.
On Nov. 7, Ventura County Sgt. Ron Helus was killed during a mass shooting at a Thousand Oaks bar.
Christian Pascual, one of the drivers involved in the three-vehicle crash that Corona was responding to, says the gunman fired from behind him and then walked off appearing to shoot at others at random.