The judge denied the request. Asked if this was a mass shooting, the sheriff said "absolutely".
At Thursday's news conference, Youngblood described the incident as part of a nationwide trend.
The names of the gunman and the five people he's said to have killed weren't immediately available.
Youngblood says Casarez had been arrested for vehicle theft in the 1980s.
After the massacre, a sheriff's deputy spotted the suspect driving on Edison Highway.
Bolanos recently filed for a change involving child support and custody over the couple's two teenage children, and the pair had a hearing set for October 11, court records show.
Six are dead, including the gunman, following a mass shooting in Bakersfield on September 12.
Kern County Sheriff Donny Youngblood talks to the media after a gunman killed five people in a shooting rampage.
A witness told the Los Angeles Times that the gunman worked at the company and suspected that De Cazarez had been involved with one of his coworkers.
Court documents show their divorce was finalized in April.
"These young children, when they see this, that's something that will stay with them the rest of their lives", he said.
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A third person was also killed at the trucking business.
Kern County Sheriff's deputies gather near the scene in Bakersfield California, where a man shot five people dead. A victim happened to be in the area and was chased around the building before being shot, he said. He then killed his ex-wife, authorities say. Casarez then turned the gun (a.50 caliber handgun) on himself. "We believe it's possibly a domestic violence incident".
It is as yet unclear how all the victims are connected to Casarez, authorities said.
It isn't clear at this time whether the shooter was an employee at the trucking company.
Then they heard more shots.
After this, the suspect carjacked a vehicle with a mother and child inside. The gunman saw the deputy and pulled into a lot.
"A man was yelling 'call the police, call the police, ' " Marion said.
David Bunting lives two doors from the Garcia home.
He says most of the large family were home when the Garcias were shot and are devastated and in shock.
He reportedly then fled and shot two people at a house.