Minneapolis / St. Paul News Blog

​Former River Falls teacher's aide Rebecca Ann O'Malley-Tietz has been arrested and charged with first degree sexual assault of a child.

The boy, a student of River Falls School District's Harbor Program, where O'Malley-Tietz worked, was 12 years old at the time of the alleged assault.

KSTP reported that, in court documents, the boy said the pair had sexual intercourse 30 to 40 times from 2007 to 2008, and that O'Malley-Tietz threatened him with a gun if he spoke about their relationship. He eventually went to his mother, who notified police in October.

WQOW-TV said she has since admitted to having intercourse with the boy, said that he forced himself on her.

If convicted, O'Malley-Tietz faces up to 60 years in prison.