The cause of death was not specified in the report.
Dr. Mills graduated from high school when she was 15 and finished college at age 18. She attended Chicago-based University of Illinois College of Medicine and graduated in 1945. She was one of less than 10 women in the 170-student class.
Before her 1986 retirement, Dr. Mills worked as a physician in various fields, including internal medicine, allergies and immunology. Throughout her career, she practiced at Chicago-based Cook County Hospital and Evanston (Ill.) Hospital.
In addition, she served as president of the Illinois Society of Allergy, Asthma and Immunology, and was a founding member of the Institute for Learning in Retirement at Evanston-based Northwestern University.
In her free time, Dr. Mills enjoyed traveling, walking and swimming. She continued to swim in Lake Michigan well into her 80s.
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