Teacher's aide charged with rape pleads not guilty by reason of insanity An investigation was launched after an employee of the school reported an "odd relationship" between 33-year-old Mandy Davis and a student. Credit: Pickaway County Sheriff's Office Author: Ryan Finfrock Updated: 7:32 PM EDT July 9, 2021 A former Teays Valley teacher's aide charged with rape pleaded not guilty by reason of insanity in Pickaway County Common Pleas Court on Friday. Sheriff Matthew Hafey says an investigation was launched after an employee of the school reported an "odd relationship" between 33-year-old Mandy Davis and a student. After the sheriff's office conducted an investigation, deputies were able to arrest Davis.