(CBS NEWS) – The man suspected of killing a police officer early Wednesday in Stanislaus County, California, is in the country illegally, authorities said Thursday.

suspected cop killer in California (Stanislaus County Sheriff’s Department)

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Stanislaus County Sheriff Adam Christianson did not publicly identify the man suspected of shooting Corporal Ronil Singh during a traffic stop, but said they know who he is and they are “pursuing every investigative lead.”

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Singh, 33, was originally from Fiji and had been with the department for more than seven years. He leaves behind a wife and young son.

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