Story highlights 16-year-old boy charged with one count of murder

Revolver has been taken into evidence, authorities say

Galvez was the kind of officer you would use as example for others, colleague says

(CNN) Three people were arrested in connection with the shooting death of a Los Angeles-area police officer who was sitting in his personal car in a parking lot behind a station, Los Angeles County Sheriff's Lt. John Corina told reporters.

One of them is a 16-year-old boy, who was charged Friday as an adult and faces one count of murder.

Abel Diaz was being held in Los Angeles County jail; his bail is $1 million.

The other suspects arrested Thursday are a 21-year-old man and an 18-year-old man.

It appears Downey Officer Ricardo "Ricky" Galvez was shot Wednesday night during a botched robbery, Corina said.

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