NACOGDOCHES, TX (KTRE) - Grand jury indictments were handed down in Nacogdoches for a husband and a wife accused of 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 Tammy Jean Butler, 37, and the 15-year-old girl began having a sexual relationship. This was discovered by Butler's husband, Marlin, 34, . Shortly afterwards, he too became involved in the sexual relationship.