BELTON - A former Bell County jailer was arrested Friday on the charge of improper sexual relationship with a person in custody, a state jail felony.

Rusty Bob Cook, 39, of Moody, was taken to the Bell County Jail, and a suggested $50,000 bond was set by Bell County Justice of the Peace Cliff Coleman, Lt. Bob Reinhard, Bell County Sheriff's Department spokesman, said in a news release.

Cook allegedly confessed he had an intentional sexual relationship with a female inmate while he was a correction officer. The inmate is 25 years old, Special Crimes Unit Lt. Michele Cianci said Thursday.

The official charge, according to the jail, is violating the civil rights of a person in custody/improper sexual activity.

He resigned his position Wednesday, according to Reinhard.

The investigation began Friday, which is when the inmate made an outcry, Cianci said.

The Special Crimes Unit, with the assistance of a Texas Ranger, conducted the investigation, Reinhard said.