The San Diego County district attorney has ruled that three police officers were justified in the fatal shooting of a Metropolitan Transit System mechanic who had just shot two of his co-workers.

District Attorney Bonnie Dumanis says in a letter released Tuesday that San Diego Officers Kelly Copeland, Jared Wilson and Kelly Besker acted in defense of themselves and one another.

The officers shot 47-year-old Lonnie Glasco on March 24 after he fatally shot two of his colleagues at the end of his shift.

The officers found Glasco in a parking lot. All three fired when he ignored orders to drop his gun and pointed it at them, authorities said.

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Information from: The San Diego Union-Tribune, http://www.signonsandiego.com