Residents remained on edge in suburban Irvine, where the first two killings occurred. Some residents have kept their children at home, others no longer walk their dogs at night.
"If he did come around this corner, what could happen? We're in the crossfire, with the cops right there," said Irvine resident Joe Palacio, who lives down the street from the home of retired police Capt. Randal Quan, who is being protected.
"I do think about where I would put my family," he said. "Would we call 911? Would we hide in the closet?"
Monica Quan and her fiance were found shot dead on Feb. 3 in Irvine. Dorner was named as the suspect on Wednesday.
A federal agent who requested anonymity because of the ongoing investigation said officials had determined a call telling Randal Quan that he should have done a better job of protecting his daughter was a prank.
The violence escalated Thursday, when police say Dorner got into a shootout with police in Corona, grazing an LAPD officer's head with a bullet before escaping. Authorities believe Dorner then used a rifle to ambush the two Riverside police officers, killing one and seriously wounding another.
Until Sunday, police had withheld the names of victims, fearing Dorner might target their families. But Riverside police said the officer killed was Michael Crain, 34, an ex-Marine and 11-year department veteran.
Officials decided to proceed with the identification and public memorial despite the possible dangers, Riverside police Chief Sergio Diaz said.
"We're not going to fail our officer and our hero," Diaz said. "We're going to bury him."
In Torrance, a pickup truck was peppered with police bullets during the manhunt, prompting a lawyer for the driver to accuse officers of being reckless.
Surfer Dan Perdue was driving to the beach Thursday when his Honda Ridgeline was stopped by officers guarding the home of a law enforcement official.
After driving away, the Ridgeline was hit by a squad car. It spun around and officers began shooting.
Perdue wasn't wounded, his attorney Robert Sheahen told the Daily Breeze of Torrance.
A police statement said officers took appropriate action as Perdue's truck, which resembled the Nissan Titan of Dorner, was leaving the area.
Late last week, the manhunt focused on Big Bear in the San Bernardino Mountains, where authorities found Dorner's burned-out truck with weapons and camping gear inside.
Authorities searched there for the fifth day on Monday, using helicopters equipped with heat-sensing technology.