NACOGDOCHES COUTY, TX (KTRE) - A husband and a wife are in the Nacogdoches County Jail tonight for the sexual assault of a teenage girl. Investigators say the case is unique because a trusted friendship may have included unlawful sex acts. Sheriff Thomas Kerss says 37 year old Tammy Jean Butler and the fifteen year old girl began having a sexual relationship. This was discovered by Butler's 34 year old husband, Marlin. According to Kerss, shortly afterwards the husband also became involved in the sexual relationship.