WOODLAND, Wash. (AP) -- A self-described Neo-Nazi who was behind bars when he made threats against a southwest Washington police officer is now headed back to prison.

The Daily News of Longview reports that 49-year-old Ronald Michael White pleaded guilty this month to charges of riot and harassment by threatening bodily harm. He's been sentenced to two years.

Court documents say White wanted to get back at a Woodland officer who investigated a 2009 fraud case that put him away for 19 months. In 2011, while still in custody, he wrote to the officer as well as the police chief. He accused the officer of having an affair with his wife. He also wrote that he'd joined a white supremacist movement in prison and had told his new family about how the officer had wronged him.

White also left a threatening voice mail for the officer after he was released from prison.

White is a registered sex offender with a history of convictions for violent crimes.

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