LOS ANGELES — Renowned primate researcher Jane Goodall of cardiac arrest, according to her death certificate obtained by on Monday nearly three weeks after she died in her sleep.

The document lists cardiac arrest as the cause of death for the 91-year-old conservationist, who passed away Oct. 1 in California while on a speaking tour. The certificate also noted epilepsy as a condition, though it remains unclear whether it contributed to her death.

The Jane Goodall Institute announced her death earlier this month, stating she had died "due to natural causes" while traveling through 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 said in a statement.

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