 After his father died in 1995, Marshall III sued his father's estate, as well as his brother, sister in-law, and nephew for an inheritance.He also sued Koch Industries and Charles and David Koch, accusing them of conspiring with his brother, E. Pierce Marshall, to influence his father and cheat him of his inheritance.In March 2001, a Texas probate jury found that J. Howard's will and trust were valid and had not been executed under fraud or malice, Pierce had not committed any wrongdoing, and that Marshall III his father's widow, Anna Nicole Smith, were not entitled to any part of his estate.