HILLSBORO, Ore. -- A former King City police officer will serve four years in federal prison after pleading guilty to child pornography and sex charges.

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Thirty-year-old Brandon Tomkins resigned from the police force last August as the city was beginning an administrative review.

Prosecutors say Tomkins gained the trust of a 15-year-old Aloha boy he met on the Internet. After months of exchanging e-mails and talking on the phone, Tomkins met the boy, who had turned 16, to have sex.

The boy is a special education student with a learning disability and told a school counselor the next day.

Tomkins must also serve five years on probation and register as a sex offender for life.