Pioneering scientist and environmental activist Dr. Jane Goodall 's cause of death has now been revealed three weeks after her passing, aged 91, which came amid a speaking tour in the US. The English native died as a result of a cardiac arrest, according to her death certificate obtained by TMZ . The document added epilepsy as a condition of note, although it is unclear if it contributed to her passing. The Jane Goodall Institute previously announced that she had died due to natural causes on October 1.

"She was in California as part of her speaking tour in the United States. Dr. Goodall's discoveries as an ethologist revolutionized science, and she was a tireless advocate for the protection and restoration of our natural world," the institute wrote in a statement.

"Dr. Goodall's

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