MEDFORD, Ore. — The half-brother of Jacqueline Kennedy Onassis, James Auchincloss, is back in jail in Oregon, accused of violating terms of his probation in a child pornography case.

A Jackson County sex offender program manager told the Mail Tribune the 64-year-old Ashland man was arrested Tuesday in Medford and is being held without bail for a hearing but did not say how Auchincloss violated probation.

He pleaded guilty in August 2010 to encouraging child sexual abuse for having computer images of naked boys. As part of his sentence, he was ordered to undergo sex offender treatment. He was in contact with officials again in December, March and June for various violations and denying that he needed therapy.