A former teacher at an El Cajon Christian school who sexually abused a preteen girl for years was sentenced last week to 15 years to life in state prison. Conover was a teacher at Christian High School. WATCH HERE WATCH HEREThe now 17-year-old sexual abuse survivor was not a student of Conover's, according to a statement released last year by Christian Unified Schools of San Diego's superintendent. The abuse survivor said at Conover's sentencing hearing on Friday afternoon that she lived with the "horrifying secret" of what happened for years. Prior to imposing the stipulated sentence, Superior Court Judge CJ Mody told Conover, "The level of trust that you have breached in this case ... cannot be overstated."