Joelle Lockwood was reported missing in July and was found in a trailer in Posey County, Indiana.
The 30-year-old has told investigators she was held against her will by Ricky House Jr., and Kendra Tooley.
The man who rescued her, Ron Higgs, said Ms Lockwood was kept in a small wooden cage and begged him to help her escape.
A couple have been arrested and face preliminary charges of rape and criminal confinement.
They have been identified as Kendra Tooley, 44, Mr Higgs’ former wife, and her boyfriend, Ricky Roy House Jr, 37.
Mr Higgs said he visited the couple’s trailer on Thursday and was dumbfounded when Tooley told him, “I’ve got a girl back here in a cage”.
“She had a t-shirt on, and that was it,” Higgs told local WFIE-TV.
“She had a leather belt, like a dog collar on.
“Every night, they locked her in there. No food, no water.”
Ms Lockwood was allowed to leave her confinement to cook and clean.
Mr Higgs said he stayed with the couple and on the second night, Ms Lockwood pleaded with him to rescue her.
“That’s when she told me on the second night with tears running down her eyes, ‘Please, do not leave here without me,'” said Mr Higgs, 61.
“And I promised her, ‘If I have to give my life to get you out of here – I will.'”
He drove her to safety on Saturday after convincing House and Tooley that he would not tell police.
Then officers moved in to arrest the suspects, who are due in court later today.
The captive was taken to hospital.
“Everybody’s calling me a hero,” Mr Higgs said.
“I’m just a pure bred American that believes in freedom.”
Agencies/Canadajournal