The South San Francisco police officer who fatally shot a 60-year-old man — who, police said, fired at law enforcement after a neighbor dispute escalated — used force legally and in justifiable self-defense, the San Mateo County District Attorney’s Office found.

The incident occurred when officers responded to a call on Arroyo Drive in South San Francisco’s Rancho Buri Buri neighborhood on April 28.

The individual who was shot, Brian Montana, was upset because he believed that his next-door neighbors allowed their lawn trimmings to blow into his yard, pointing a handgun at one neighbor and eventually shooting through their front door as they ran for cover, according to the investigation completed by the DA’s office.

The neighbors called the police, who arrived at the scene around 5:55 p

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