Murder and attempted murder charges were filed Friday against a young man who allegedly joined a convicted felon in gunning down a 20-year-old Menifee resident and wounding the victim’s friend.

Isaac Manuel Delarosa, 18, of Menifee was arrested Wednesday in connection with the slaying earlier this year of Antonio Quintero.

Delarosa, who’s also facing sentence-enhancing gun and great bodily injury allegations, is being held without bail at the Smith Correctional Facility in Banning and is slated to make his initial court appearance Monday at the Southwest Justice Center in Murrieta.

Delarosa’s co-defendant, 21-year-old Kenneth Alan Harmon of Menifee, was arrested at the beginning of the month following a Riverside County Sheriff’s Department investigation that began in February.

Harmon is charged almost identically, though he also faces an allegation of being a convicted felon in possession of a firearm.

He’s being held without bail at the Robert Presley Jail in Riverside and is expected to appear jointly with Delarosa.

There was no word on how detectives ultimately identified the pair as the alleged perpetrators.

According to sheriff’s Sgt. Rick Espinoza, Quintero and an associate were in his vehicle, parked in the 28000 block of Sparacio Road, just east of Antelope Road, on the afternoon of Feb. 9 when the defendants allegedly opened fire on them.

A possible motive was not disclosed.

Deputies were sent to investigate the shooting and discovered Quintero and the other victim, whose identity was not disclosed, unconscious and “suffering from traumatic injuries,” according to the sergeant.

The shooters had fled.

The victims were taken to Riverside University Medical Center in Moreno Valley, where Quintero died a short time later. The other man survived and has since recovered.

According to court records, Harmon has prior convictions for malicious destruction of property, illegal possession of a gun, burglary, being under the influence of drugs while armed and receiving a stolen vehicle.

Delarosa has no documented prior felony convictions in Riverside County.

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