He cried "shots fired" over the radio and then went silent.
The public was asked for information about his identity and the California Highway Patrol warned that he was considered armed and unsafe. It quoted Stanislaus County Sheriff's Department spokesman Raj Singh as saying that he knew the officer who was killed.
The suspect had already left the scene before additional officers arrived. Newman is about 25 miles south of Modesto in Stanislaus County. They rushed the husband and father of an infant boy to a hospital, where he was pronounced dead. The Stanislaus County Sheriff's Office has released a photo of the suspect believed to be responsible for the shooting, as well as a vehicle.
CHP issued a "Blue Alert" for the suspect, whom the state agency described as a heavy-set Hispanic man with black hair.
Ronil Singh was a veteran of more than 7 years at the Newman Police Department and was assigned as a canine officer.
The Stanislaus County Sheriff's Department is leading the investigation.
It was a hard way to finish Boxing Day for the Singh family of Naitata, Navua after receiving news of their son, Ronil Singh being shot in the line of duty in California.
The suspect was reported to be driving a silver Dodge Ram 1500 extended-cab pickup truck, model year 2002 to 2009.
Tributes and condolence messages for Ronil Singh poured in from police departments and officials across the country. California Gov. Jerry Brown ordered all flags fly at half-staff in honor of Singh.
Anyone with information regarding the identity of the suspect is asked to contact Detective Michael Fisher at 209-525-7083 or dispatch at 209-552-2468.