Motive for slaying of California policewoman still a mystery

This Aug. 2, 2018 photo provided by Williams Pioneer Review shows Merced Corona, left, pins his daughter Natalie Corona's badge on her uniform during

This Aug. 2, 2018 photo provided by Williams Pioneer Review shows Merced Corona, left, pins his daughter Natalie Corona's badge on her uniform during

Mourners place flowers on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davi

Mourners place flowers on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davi

Flowers are seen on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davis, Cal

Flowers are seen on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davis, Cal

Flowers are seen on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davis, Cal

Flowers are seen on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davis, Cal

Mary Ann Doerzbacher wipes her eyes after placing flowers on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Cor

Mary Ann Doerzbacher wipes her eyes after placing flowers on a memorial outside the Davis Police Department for slain Davis Police Officer Natalie Cor

Authorities inspect the patrol vehicle driven by Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davis, Calif. Corona, 22, who had been

Authorities inspect the patrol vehicle driven by Davis Police Officer Natalie Corona, Friday, Jan. 11, 2019, in Davis, Calif. Corona, 22, who had been

Matthew Ottele draws a star on the sidewalk Friday, Jan. 11, 2019, near the scene were Davis Police Officer Natalie Corona was shot and killed in Davi

Matthew Ottele draws a star on the sidewalk Friday, Jan. 11, 2019, near the scene were Davis Police Officer Natalie Corona was shot and killed in Davi

Vicky Oliverius ties blue ribbons on trees, Friday, Jan. 11, 2019, near the scene were Davis Police Officer Natalie Corona was shot and killed in Davi

Vicky Oliverius ties blue ribbons on trees, Friday, Jan. 11, 2019, near the scene were Davis Police Officer Natalie Corona was shot and killed in Davi

DAVIS, Calif. (AP) — Authorities say it's a mystery why a gunman on a bicycle ambushed a Northern California policewoman and narrowly missed wounding others in an apparently random shooting that ended in suicide.

The small college town of Davis is mourning 22-year-old Officer Natalie Corona, who was shot as she investigated a traffic accident Thursday night.

Police Chief Darren Pytel says the man wasn't involved in the three-car crash and opened fire from the shadows, hitting Corona in the neck and then firing more shots as she lay on the ground.

Pytel and witnesses say he then shot at a firetruck, a passing bus and a house. He later shot himself inside a nearby home.

Police say Corona was a beloved officer and the small department is devastated.

A candlelight vigil for the slain officer is planned for Saturday night.