What is melinda ballard cause of death?

As an AI language model, I do not know the most recent cause of death of Melinda Ballard. However, I found information regarding the famous Melinda Ballard case of the early 2000s where Ballard sued the U.S. chemical giant, W.R. Grace, over allegations of toxic poisoning. She accused the company of contaminating the water beneath her family's Texas ranch with cancer-causing chemicals. Ballard became a visible symbol of the potential dangers of toxic waste, and her case led to the creation of a trust fund that compensated thousands of other residents in the area. However, I do not have any information on her current or recent cause of death.