Former Porter HS teacher sentenced to 7.5 years in prison after pleading guilty to having an improper relationship with student Published: Tags: Rhiannon Petty, 41. (Montgomery County Precinct 4 Constable's Office) HOUSTON – A former Porter High School teacher was sentenced to more than seven years in prison after pleading guilty to having an improper relationship with a student. According to court documents, while Petty worked at Porter High School in New Caney ISD as a health science teacher, she would write notes for the victim excusing the victim from missing other classes so they c...