ATOKA, OK-- Donna Goodson said one of her relatives was 16-years-old when she admitted she had sex with her biology teacher for a better grade.
"He was tutoring her to bring her grades up. If she did this she would get an A and if did this and so on. And she had sent him pictures of her in her bra and panties."
According to an affidavit, 32-year-old Casey Hauff had multiple sexual encounters with several female students at Atoka High School.
The Oklahoma Bureau of Investigation was asked by the Atoka County Sheriff's office to investigate Hauff last fall.
The OSBI found sexual acts had been going on since January of 2010.
"OSBI opened the investigation and actually found 5 female victims who had sexual contact with this coach at his request. Several actually had intercourse with him. Some preformed oral sex and and just exchanged photographs and various states of undress," said Jessica Brown, OSBI spokesperson.
Hauff turned himself into the Atoka County Jail Friday morning, after an arrest warrant was put out on Thursday. He has been charged and arraigned on 11 felony counts. All of the students involved were 16 years old or younger.
Second degree rape, solicitation of a minor and sexual battery were just some of the charges filed at the Atoka County Court House against Casey Hauff.
Hauff resigned in October 2011 when news of the investigation broke.
Goodson said she's thankful her relative came forward and told the authorities what happened.
"Knowing that she has helped and she will really be happy that others have come forward. Like I told her, all her little cousins and these two here. You're saving everybody. You're saving Lane schools and all the others schools that are coming to be in his class."