A 42-year-old correctional officer at the Silverdale Jail admitted having sex in a cell with a 26-year-old inmate, authorities said.
Angela Marie Just, of 28th Street in Cleveland, Tn., was charged with sexual contact with inmates.
A detective said in late June he investigated a sexual relationship between Ms. Just and Nikolas Milton, who was in jail for assault.
Administration at Silverdale gave the detective of a phone call made by Milton to Ms. Just on June 24. She had just gotten off work just before the phone call.
Authorities said, "The two talked in explicit detail about the sex they had had with each other during that shift."
Ms. Just at the time had been employed with Core Civic for eight months and had gone through Prison Rape Elimination Act training.
Authorities said Ms. Just admitted to the relationship with Milton.