LOS ANGELES (AP) — A suspected motorcycle gang member has pleaded not guilty to gunning down a Pomona police officer.

City News Service says 36-year-old David Martinez entered the plea Wednesday in Los Angeles to a charge of murder with special circumstances. Prosecutors haven’t decided whether to seek the death penalty.

Authorities say a Pomona SWAT officer, Shaun Diamond, was shot on Oct. 28 as he helped serve a warrant at a home in the Los Angeles suburb of San Gabriel.

A shotgun blast struck Diamond in the head and he died the next day.

Los Angeles County prosecutors say Diamond was part of multiagency police operation targeting members of the Mongols motorcycle gang.

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