A now-retired Atlanta FBI agent was sentenced to probation on charges that he shared confidential law enforcement information with his married mistress.

In pleading guilty to a federal misdemeanor charge, Ken Hillman admitted he allowed the woman and her now-former husband to participate in undercover child sex sting operations.

Hillman ran a joint local-federal Internet Crimes Against Children Task Force in northwest Georgia.

He told a federal judge on Friday he accepted he had violated FBI policy but said he suffered from post-traumatic stress disorder because of the disturbing images he saw daily.

"It seemed the chat rooms I would go into would routinely become worse and worse and worse," he said.

MORE: Former FBI agent’s plea could jeopardize child sex prosecutions

Hillman pleaded guilty in July to a single charge charge that federal prosecutors brought just weeks before time would have run out on bringing criminal charges against the veteran agent.

Attorney Steve Sadow, right, stands alongside witness Angela Russell at the Catoosa County Courthouse on Friday, May 8, 2015. Photo: Courtesy Chattanooga Times Free Press

Credit: Doug Strickland /Times Free Press

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Credit: Doug Strickland /Times Free Press

Court documents show that Hillman allowed Angela Russell, with whom he had a sexual relationship, to help lure some would-be child predators online even though she was not in law enforcement. Russell was granted immunity.

The task force Hillman ran has since been disbanded.

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