Judy was 24 years old, a zoo spokesperson said she had arthritis due to her advanced age and had recently lost a significant amount of weight.
The zoo decided to euthanize Judy since staff could not ensure her a good quality of life.
Judy arrived at the Brookfield Zoo in 2001.She had been living at the zoo's Great Bear Wilderness since 2010. A Native American blessing ceremony was performed to welcome them to their new land.
Before dying, representatives from Midwest SOARRING Foundation, a local non-profit, performed a ceremonial blessing of Judy.
Representatives reflected on the importance of the bison in North America.