GWINNETT COUNTY, Ga. -- A former deputy with the Gwinnett County Sheriff's Office has turned himself in after an investigation revealed the 40-year-old engaged in illegal sexual activity with an inmate during a transport.

Terry Henderson was fired from the sheriff's department Sept. 26 after an investigation revealed he engaged in illegal sexual activity with an inmate he was transporting to the Gwinnett County Jail from another facility in south Georgia. The alleged sexual assault was reported by the inmate on Sept. 14.

Henderson turned himself in to the Butts County Sheriff's Office Monday, after a warrant was issued for his arrest. He was charged with Violation of Oath of Office and Sexual Assault and is now being held at the Butts County Detention Center.

The former deputy was with the Gwinnett County Sheriff's Department for 12 years. In a statement, Gwinnett County Sheriff Butch Conway called the behavior "inexcusable and offensive to the many men and women who proudly wear the badge and perform their duties each day with integrity."

The statement went on to say that deputies receive extensive training on laws regarding supervision of inmates in custody, which outlines that an inmate in custody cannot give consent for any sexual activity.

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