MODESTO, CA (KMJ) – An alleged cop killer is arraigned Wednesday in Modesto. Gustavo Perez Arriaga told the judge at the Stanislaus County Curthouse that his name is actually Paulo Virgen Mendoza, and that Arriaga was an alias. Mendoza has been charged with the murder of 33-year-old Corporal Ronil Singh, along with a special…… MORE