PORTLAND -- A former Sherwood High School principal was sentenced Tuesday to more than ten years in prison for the possession of child pornography.

Robert Paul Patton pleaded guilty to the charges. It was his fourth conviction for a sex-related crime.

Patton had a criminal history going back to when he was a high school principal who possessed child pornography and sexually abused a teenage boy, U.S. Attorney Amanda Marshall said. Patton s conduct was particularly concerning, because it suggests an ongoing sexual interest in children that did not abate following his first conviction.

In 2003, he was convicted in Washington County of possessing materials depicting sexually explicit conduct of a child and two counts of third degree sexual abuse, after twice having sexual relations with a 16-year-old boy.

In 2011, he was convicted in Multnomah County of failure to register as a sex offender. In 2013, he was convicted in Multnomah County of attempted first degree sexual abuse in connection with an incident involving a 12-year-old boy.

After his prison time, Patton's contact with minors will remain restricted. He will also face restrictions on where he may live and how he can use computers.

In addition, Patton must participate in a sex offender treatment program and register as a sex offender.

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