Marshall died of pneumonia at the age of 90 in Houston, Texas, on August 4, 1995. Following Marshall's death, Anna Nicole Smith (who died on February 8, 2007) became involved in a court battle with her former stepson, E. Pierce Marshall (who died on June 20, 2006). J. Howard's will and trust did not include Anna Nicole or J. Howard's other son, J. Howard Marshall III. The legal dispute worked its way through both state and federal courts as Anna Nicole and J. Howard III sought to overturn the will and trust. In 2001, they both lost their cases during a six-month Texas state court jury trial, upholding Marshall's will and trust.