A state appellate court panel has dismissed an appeal filed by two half-brothers from Montebello who pleaded guilty in a crime spree that included the 2015 killing of a Downey police officer who was shot in the face while sitting in his BMW in a parking lot near the police station.

In a ruling Thursday, the three-justice panel from California’s 2nd District Court of Appeal found that Steven Knott and Jeremy Anthony Alvarez “clearly waived their right to appeal their sentences and those waivers extended to their challenges to the imposition of the firearm enhancements.”

The appellate court panel’s opinion noted that the two defendants sought to have a firearm enhancement struck against each of them “to enable them to obtain the benefit of the district attorney’s new charging and resentencing policies.”

Knott and Alvarez were sentenced last September under prior District Attorney Jackie Lacey’s administration.

Knott is serving a 50-year-to-life state prison term in connection with his March 2020 guilty plea to first-degree murder and attempted robbery charges in the Nov.18, 2015, slaying of Officer Ricardo Galvez.

Alvarez was sentenced to 30 years to life in state prison for his guilty plea to second-degree murder and attempted robbery stemming from Galvez’s shooting death.

The pair also pleaded guilty to an attempted murder in Montebello on October 18, 2015, along with the takeover robbery of two victims at a Bellflower cell phone store and a street robbery in Paramount shortly before Galvez’s murder.

They both admitted gun and gang allegations, and Knott also was convicted of shooting at a dwelling in South Gate in September 2015, according to the Los Angeles County District Attorney’s Office.

Galvez, a former U.S. Marine and five-year veteran of the Downey Police Department, was dressed in plain clothes after working with the department’s K-9 team when he was shot as he sat in his personal car in the police station parking lot.

Alvarez, the getaway driver, was arrested after a wild pursuit that was caught on dash-camera video recorded from the patrol car of a Downey police officer who heard the gunshot in the area of the parking lot and began chasing the Nissan Altima.

Knott and a 16-year-old boy were arrested the next morning. The teenager subsequently admitted a Juvenile Court petition charging him with Galvez’s murder and attempted robbery and a robbery count involving another man the same day. He faces confinement in a state juvenile facility until he is 25.

Investigators recovered a handgun that was thrown out of the getaway vehicle. DNA testing and fingerprint analysis linked Knott to the weapon, according to stipulations agreed to by the prosecution and the defense at a hearing in 2017.

Prosecutors say ballistics tests determined that the gun had been used to kill the 29-year-old officer, who had served two tours of duty — one in Iraq and one in Afghanistan — prior to becoming a police officer.

In emotional testimony in September 2017, Downey police Lt. Brian Baker said he walked out to the parking lot to investigate what might have happened after speaking on the phone with Officer Justin Prentice, who had chased the light-colored Altima to Montebello.

The lieutenant said he did not initially recognize Galvez or his car, and only realized that the victim was his colleague after looking through the vehicle’s windshield.

“That’s when I recognized it was Ricky. When I recognized him, I couldn’t believe what I was seeing,” Baker said.

Baker said the BMW engine was running and he noticed a bullet hole in the driver’s side window, then directed a sergeant to break the passenger window of the locked car. They determined that the officer was dead, and a check of the vehicle’s registration confirmed the car belonged to Galvez, Baker said.

Los Angeles County sheriff’s Sgt. Richard Biddle testified that the suspects’ attempt to rob Galvan “wasn’t completed. They didn’t get anything inside the car. The gun went off and they fled.”

When he was shown a still photo from surveillance camera footage in the parking lot, the teenager subsequently admitted that he and Knott had approached the BMW — one from each side — while Alvarez remained inside the Nissan Altima, Biddle testified.

The teenager subsequently was tape-recorded in jailhouse conversations in which he admitted being involved in the crime and saying that the three formulated a plan to rob Galvez, according to the sheriff’s sergeant. The teenager said he and Knott wore masks made of pieces of cloth over their faces.

Under cross-examination, Biddle said the teenager claimed the gun wielded by Knott had gone off accidentally.

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