The Napa County Sheriff’s Department on Wednesday released body-worn camera footage from a weekend police shooting that killed an armed motorist, and it appears to show that the motorist fired at the deputy first before she shot back and killed him.

Napa County sheriff’s Deputy Riley Jarecki was on solo patrol Sunday night when she checked on a driver parked on the 1100 block of Henry Road in a southern part of the county, said Henry Wofford, a sheriff’s spokesman.

Jarecki was conducting a vehicle check, where deputies search to see if occupants of a vehicle require help or if there is something “nefarious” going on inside, Undersheriff Jon Crawford said in a Wednesday afternoon news conference.

The two talked for a few minutes before Jarecki asked to look inside of the red Honda that 43-year-old Javier Hernandez Morales was driving, Crawford said.

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In the 48-second clip, from the passenger side, Jarecki shines a bright flashlight into the car parked on the 1100 block of Henry Road.

“Can I look around and make sure?” she says as she gestures at the interior of the car, and the suspect, wearing a camouflage hoodie, throws his hands up. “All right, wait right there, don’t move, OK?” the deputy says.

“OK,” Hernandez Morales responds in Spanish as he throws his hands up again. “No problem, I don’t have problems.”

She walks to the driver’s side, raps on the glass and repeatedly asks Hernandez Morales to roll down the window.

He hesitates, looking back and forth from the inside of the car to the deputy.

“What’s up?” he says in Spanish as he rolls down his window.

Twelve seconds after Jarecki’s initial request, Hernandez Morales whips out a .22-caliber revolver, firing at least one shot at her at point-blank range.

The body camera footage gets shaky as the deputy races away from the driver’s window.

“Shots fired, shots fired,” Jarecki calls into her radio, and then as the car engine sounds like it’s revving, she fires 15 shots into the passenger side of the car. The video ends on the last shot.

“Hernandez Morales fired from close proximity, essentially without warning, and it’s pretty obvious to us he intended to kill her,” Crawford said Wednesday.

Responding officers declared Hernandez Morales dead at the scene.

A second firearm, a loaded .22-caliber rifle, was discovered in the car, Crawford said. The revolver had been reported stolen in Fremont.

The car was not reported stolen, but it was not registered in his name.

Hernandez Morales had at least five prior arrests for violations including possession of a concealed and loaded firearm, assault on a peace officer, and driving under the influence. It’s unclear if he was convicted on any of those charges.

He had “a few warrants” out for his arrest and went by “several aliases,” delaying the release of his identity, but officials did not provide details.

Jarecki was not injured and has been placed on administrative leave, which is standard under department protocol, they said.

According to the department’s Facebook page, Jarecki was sworn in as a deputy sheriff on June 20, 2018.

Authorities are still trying to figure out what prompted Hernandez Morales to open fire on Jarecki.

“There were two people there and oftentimes you just never find out,” Crawford said. “I’d love to be able to ask him.”

Wofford said the incident is being investigated by the Napa County Major Crimes Task Force, a panel that includes the Sheriff’s Department, the Napa Police Department and the Napa County district attorney’s office.

Gwendolyn Wu and Lauren Hernández are San Francisco Chronicle staff writers. Email: gwendolyn.wu@sfchronicle.com lauren.hernandez@sfchronicle.com Twitter: @gwendolynawu @LaurenPorFavor