Suspect arrested on suspicion of attempted murder in Brentwood shootout that killed 17-year-old

BRENTWOOD — A 20-year-old Walnut Creek man who survived a shootout involving two others that killed a 17-year-old last week has been arrested on suspicion of attempted murder, authorities said Tuesday.

The July 14 shooting happened during an attempted robbery that happened about 7:45 p.m. in the 800 block of Marjoram Drive, police said. Two suspects, the 20-year-old who’s been arrested, and the 17-year-old who died, are suspected of trying to rob a 21-year-old Antioch man, according to police.

All three fired guns, police said.

Authorities did not identify the 17-year-old Tuesday, citing the investigation and the lack of notification to his relatives.

Brentwood police spokesperson Lt. Walter O’Grodnick said police arrested the 20-year-old at the scene, and booked him after the shooting. He also is suspected of attempted robbery, conspiracy, assault with a deadly weapon, false imprisonment, discharging a gun at an occupied vehicle, and carrying a loaded gun in public, O’Grodnick said.

The case had not been filed formally before 3 p.m. Tuesday by the Contra Costa County District Attorney’s Office, DA spokesperson Ted Asregadoo said.

The suspect was in custody Tuesday at the Martinez Detention Facility in lieu of $2.575 million bail.

O’Grodnick said via email that the investigation shows the bullet that killed the 17-year-old appears to have come from the 21-year-old robbery victim but that police were “still trying to work through evidence to rule out if the surviving suspect also shot the decedent.”

The homicide investigation is the first in the city of Brentwood since August 2022, when a 21-year-old Antioch man died in a shooting outside a gym. Police arrested a 17-year-old on suspicion of murder after that shooting.