FILE – This undated booking file photo provided by the Stanislaus County Sheriff’s Department shows Gustavo Perez Arriaga. Prosecutors charged Perez Arriaga on Wednesday, Jan. 2, 2019, with murder in the killing of Newman police Cpl. Ronil Singh. He was arrested Friday in the Dec. 26 shooting during a traffic stop. (Courtesy of Stanislaus County Sheriff’s Department via AP, File)

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