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Arriaga crossed into Arizona from Mexico a couple of years ago and had been working as a farm laborer in California's Central Valley, Christianson said. He has two prior DUI arrests, authorities said.

Christianson blamed California's newly enacted “sanctuary state” law, SB 54, passed in October in response to President Donald Trump's immigration policies, for prohibiting law enforcement in the state from reporting Arriaga as a \"criminal illegal alien,\" to U.S. Immigration and Customs Enforcement.

\"PHOTO:
Stanislaus County Sheriffs Department
PHOTO: Gustavo Perez Arriaga, , who is accused of gunning down a Northern California police officer was taken into custody Friday, Dec. 28, in Bakersfield, CA. following a massive manhunt, officials said.
>

The day after the shooting, as authorities scoured the state for Arriaga, Trump tweeted, \"Time to get tough on Border Security. Build the Wall!\"

Singh, originally from Fiji, had been with the Newman Police Department since July 2011 and had previously worked at the Merced County Sheriff's Department, California Gov. Jerry Brown said in a statement. He is survived by his wife and a 5-month-old son.

Arriaga's public defender, Dan Martin, did not immediately return ABC News' request for comment.

ABC News' Bill Hutchinson, Emily Shapiro and Gina Sunseri contributed to this report.

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