The parents asked investigators to conduct a forensic review of their son's phone, officials said. Investigators say they discovered evidence that Day and the boy already had sex and had made plans to have sex again at her home on Wednesday. Using the boy's phone, investigators sent Day a text message confirming the meeting. Day said "yes," officials said.
She also told the boy to hurry up before her husband got home, officials said.
When investigators arrived at Day's home, they sent a text message from the boy's phone that said "I'm here," officials said. Day responded with a message that read, "the doors unlocked as usual." Investigators opened the door and identified themselves.
Officials said Day fully cooperated and admitted to the sexual relationship, as well as sending photos of herself in her bra and panties. She said she had received photos of the boy's genitalia.
Day's attorneys could not be immediately reached.
Day was hired to teach science at Yukon High School at the beginning of the school year, according to an October report by Oklahoma City-based News 9. She was among the state's 1500 emergency certified teachers hired without education training to help mitigate teacher shortages. It's one of many ways Oklahoma is dealing with a deepening budget crisis that has forced class sizes to surge, art and foreign-language programs to shrink or disappear and - in many districts - schools to operate just four days a week.
News 9 reported that Day had little to no teaching experience. She held a degree from Oklahoma Baptist University and at one point planned to go to medical school. Day had a 10-month contract to teach at the school, but said she planned to get her certification requirement so she could return next year.
Emergency certified teachers are filling classrooms in Oklahoma from pre-K through high school, and attend training throughout the school year that help them handle student behaviour problems and other classroom issues, News 9 reported.
"I think my biggest concern when I first travelled down this route was behaviour management," Day told News 9 in October. "I was worried that I wouldn't be able to manage the kids or that they would look at me and see how young I am and think 'Oh, well you're just a kid too and I don't have to listen to you'."
Yukon Public Schools said in a statement Thursday that officials conduct background checks on employees before hiring them, and that nothing alerted them of Day's alleged behaviour. The school district is cooperating with authorities and can't release additional information about the incident while its investigation remains open.
News 9 reported Thursday that Day's husband is a football coach at the school.
