MEDFORD, Ore. — The half brother of the late Jacqueline Kennedy Onassis has pleaded guilty to charges he possessed child pornography.

James Auchincloss was sentenced Wednesday to 30 days in jail and three years probation on two felony counts of encouraging child sex abuse, the charge generally brought against people possessing child pornography.

The 63-year-old was a boy when he carried Jackie’s wedding train up the aisle as she married John F. Kennedy.

Auchincloss was indicted a year ago on 25 counts after his personal assistant, Edward McManus, told investigators he had seen Auchincloss and Dennis Vickoren viewing pictures of naked boys in sexual poses at Auchincloss’ home in Ashland.

Vickoren received the same sentence Wednesday.