Corona fell to the ground with a single gunshot to the neck, but Pytel said the suspect continued firing, unloading a magazine from a semi-automatic handgun.
Corona, 22, died within minutes of arriving at the scene of a three-car accident.
He says the family is not angry.
In 2016, Corona posted a photo of herself on Facebook wearing a blue dress and a "thin blue line" USA flag that honors law enforcement officers.
Another witness, Shaun Kingston, said he heard at least 10 gunshots. Davis police officers and neighboring agencies surrounded the area and set up a perimeter. He said as terrified bystanders ran, he saw the shooter calmly walk away before he lost sight of him in the crowd.
A Davis Police Department honor guard will remain with Corona's body until her burial.
The shooter, who later died from what police said was a self-inflicted gunshot wound, shot Corona several more times. Corona, just a few weeks into her solo patrol assignment after completing a six-month field training program, was dispatched to the scene.
There, he met with a roommate, "and really didn't show any signs that he had just been involved in this incident", Pytel said.
"She was very proud", her father told Fox40-TV, choking back tears as he spoke about how much she loved her job.
Police say the suspect was later found dead in a house near the shooting. Police have not said anyone other than the officer was shot. "That's when I heard the shots", Pascual told the news outlet, adding that the bullets rang out so close to him that he was suffering from hearing loss Friday morning.
From his vantage point, across the street, Kingston said he saw the gunman shoot at a firetruck and reload expertly.
He said his family's faith will get them through this.
Also bolstering the staff has been the overwhelming response from the community, which throughout the day Friday delivered bouquets of flowers, food and handwritten notes and posters honoring Corona and thanking her fellow officers for their service.
"I don't remember her talking about anything else than wanting to become an officer", Gomez, 26, said, "He prepared her to go to the (police) academy".
The suspect was later found dead in a house near the shooting. She's the daughter of a cop and was on the job for only a few weeks.
Police have not determined what prompted the attack.
News of the officer's death was reported by Marlei Martinez at KCRA News.
On Friday morning, Sacramento County Sheriff's Department crime scene investigators told KTVU that the suspect hit several vehicles including the patrol auto three times, a fire truck four times and several cars on the street. She graduated June 23 from the Sacramento Police Academy after receiving an associate degree in administration of justice from Yuba College. Corona was taken to UC Davis Medical Center in Sacramento, where she later died.
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. He has not been identified.
Her death follows the killing of a central California officer on December 26 during a traffic stop. Authorities have yet to released the identity of the deceased suspect.
The shooter opened fire as Corona was investigating a three-car-crash in the city west of Sacramento, a college town that is home to the University of California, Davis where there has not been a fatal police shooting in almost 60 years.
The shooting happened on a street lined with mature trees and bordered by churches on both sides.
Following the shooting, police issued a citywide shelter in place order as officers searched for the suspect, who was later found in a house located near the shooting.