Eyewitness News was in the courtroom early Wednesday morning and captured images of 47-year-old Angelo Jose Saldivar, 47, wearing a back brace seated in a wheelchair. His arraignment had been postponed until he was medically cleared to face charges.
On Monday, prosecutors filed 10 charges against him, including two special allegations.
San Bernardino County District Attorney Jason Anderson said Saldivar faces a murder charge with two special circumstances, including the killing of a peace officer in the line of duty and killing a peace officer in order to escape. Saldivar entered a not guilty plea on a range of charges, including murder.
Those special circumstances could mean a life behind bars without the possibility of parole for Saldivar.
Investigators said Nunez was responding to a domestic dispute last week when Saldivar allegedly opened fire.
Prosecutors said the suspect had been involved in a violent argument with his ex-wife outside of a Rancho Cucamonga condo complex.
On Wednesday, he pleaded not guilty to charges of attempted kidnapping and false imprisonment of his ex-wife.
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Saldivar also faces four counts of assault with a deadly weapon. Authorities said several of the victims were neighbors or bystanders who called 911 for help.
"Most of those other victims were actually reporting parties that were calling in to 911, and in some of those instances, you can actually hear in the 911 call some of the shots that were fired," Anderson said.
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After the shooting, investigators said Saldivar fled on a motorcycle, leading deputies on a high-speed chase along the 210 Freeway before being stopped by an off-duty narcotics deputy, who used a maneuver that ended the pursuit, forcing Saldivar to crash into the center divider.
Salvidar is being held without bail and is due back in court next week for a preliminary hearing.
San Bernardino County Sheriff Shannon Dicus said funeral arrangements are being made for Nunez, a six-year veteran of the department.
"We know the public wants to be involved in this, and we are going to try and make all those considerations, obviously taking what the family wants," Dicus said.
Nunez is survived by his wife, their two-year-old daughter, and his wife is expecting the couple's second child.