The half-brother of Jacqueline Kennedy Onassis spent Christmas in jail after allegedly violating his probation for his August conviction on child pornography charges.

The half-brother of Jacqueline Kennedy Onassis spent Christmas in jail after allegedly violating his probation for his August conviction on child pornography charges.

James Auchincloss, an Ashland resident, was arrested Wednesday and lodged at the Jackson County Jail, where he is being held without bail. He is scheduled to be released Jan. 21.

Auchincloss, 63, is not believed to have committed any new crimes but is suspected of violating the terms of his supervision, said Nate Gaoiran, program manager of the sex offender unit for Jackson County Community Justice.

Auchincloss failed to comply with the rules of his sex offender treatment program and accepted the sanction of spending 30 days in jail, said Deputy District Attorney David Hoppe.

"I think he understands the seriousness of the situation and he's going to have 30 days to think about it," Hoppe said.

Auchincloss apparently failed to report all of his behavior to his sex offender treatment group and disclosed that he had been negligent just before a scheduled polygraph test, Hoppe said.

"He has to follow certain rules while in sex offender treatment and apparently he wasn't doing that," Hoppe said. "He has to treat it very seriously, otherwise he's going to go to prison."

Auchincloss' behavior did not involve anything illegal, but he was suspended from his treatment group because he didn't follow all of the rules, Hoppe said.

"He just has to do what he's told to do," Hoppe said. "In sex offender treatment, the rules are very strict."

Auchincloss' attorney, Carl Caplan, did not return a phone message seeking comment.

Auchincloss' probation officer, Glenn Sandy, initiated the arrest, after becoming aware that Auchincloss may not have complied with the terms of his supervision, Gaoiran said.

The arrest and jail lodging are standard protocol for a suspected probation violation, Gaoiran said.

"We're consistent with the way we supervise all offenders," he said. "Mr. Auchincloss is no exception."

This is the first time Auchincloss has been back in jail since Jackson County Circuit Court Judge Mark Schiveley sentenced him on Aug. 18 to 30 days for two felony counts of first-degree encouraging child sexual abuse, Gaoiran said.

As part of a negotiated plea agreement with Jackson County prosecutors, Auchincloss acknowledged possessing and distributing photographs of prepubescent children, images prosecutors described as lewd and lascivious in nature.

Schiveley also ordered Auchincloss to serve three years' probation, during which he must stay away from children and undergo sex-offender treatment. He must also be registered as a sex offender for the rest of his life.

Ashland police began investigating Auchincloss and an associate, Dennis Vickoren, in connection with child pornography in the summer of 2008. That October, police searched their homes and found graphic images of young boys, according to search warrant affidavits.

Auchincloss was originally indicted on 25 felony counts of encouraging child sexual abuse in August 2009 and initially pleaded not guilty to the charges. Vickoren was indicted on 30 felony counts and also initially pleaded not guilty. Both later pleaded guilty to two felony counts each of first-degree encouraging child sexual abuse.

Vickoren, who is not back in jail, was convicted on the same child pornography charges as Auchincloss and received the same sentence.

Contact reporter Hannah Guzik at 541-708-1158 or hguzik@dailytidings.com.