A San Augustine man has pleaded guilty to an inappropriate relationship with a 16-year-old girl, accepting an eight-year prison sentence. The sheriff's office began investigating the case in 2011 when officials at a school in the county reported rumors of the girl having a sexual relationship with an adult. Billy Gene Childress, 56, waited until a jury had been selected for his trial before deciding to plead guilty, according to District Attorney Kevin Dutton. Childress' daughter, Margaret Childress who assisted her father will plead guilty to a lesser charge, after agreeing to testify against her father.