The Latest on the death of a California police officer and search for the killer (all times local):

11:25 a.m.

A California sheriff says the suspect in the shooting death of a police officer is in United States illegally.

Stanislaus County Sheriff Adam Christianson told reporters Thursday that authorities have identified a suspect but didn’t name him. Authorities are still searching for the attacker.

Christianson’s agency is leading the investigation into the slaying of Cpl. Ronil Singh of the small-town Newman Police Department.

The sheriff says Singh pulled over the attacker as part of a DUI investigation Wednesday and that the officer fired back to try to defend himself.

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12 a.m.

Authorities are hunting the man suspected of killing a policeman who stopped his truck in a small California town.

Thirty-three-year-old Ronil Singh was shot Wednesday after stopping a pickup truck without a license plate in Newman, about 100 miles (160 kilometers) southeast of San Francisco.

The truck was later found but the gunman is at large.

Authorities say surveillance photos taken at a convenience store shortly before the attack show the suspect, a heavy man with short dark hair wearing a chain necklace, dark T-shirt and jacket.

The Stanislaus County Sheriff’s Department says police agencies throughout California and out of state have been alerted.

Singh was a native of Fiji who joined the Newman police force in 2011. He is survived by a wife and an infant son.

This undated photo provided by the Newman Police Department shows officer Ronil Singh of Newman Police Department who was killed by an unidentified suspect. (Stanislaus County Sheriff's Department via AP)
This undated photo provided by the Newman Police Department shows officer Ronil Singh of Newman Police Department who was killed by an unidentified suspect. (Stanislaus County Sheriff’s Department via AP)
This Wednesday, Dec. 26, 2018 image from a surveillance camera video and provided by the Stanislaus County Sheriff's Department shows a suspect police are searching for in connection to the fatal shooting of an officer during a traffic stop in Northern California. (Stanislaus County Sheriff's Department via AP)
This Wednesday, Dec. 26, 2018 image from a surveillance camera video and provided by the Stanislaus County Sheriff’s Department shows a suspect police are searching for in connection to the fatal shooting of an officer during a traffic stop in Northern California. (Stanislaus County Sheriff’s Department via AP)
Police investigate the scene of a shooting that took the life of Newman Police Officer Ronil Singh, 33, on Wednesday, Dec. (Deke Farrow/The Modesto Bee via AP)
Police investigate the scene of a shooting that took the life of Newman Police Officer Ronil Singh, 33, on Wednesday, Dec. (Deke Farrow/The Modesto Bee via AP)

Source: The Associated Press