How did Bushman die?
I assume that you know of the display at The Field Museum on the ground floor? The display is just off the elevator. I know that they have a panel about his life and death. If that fails, send the Field Museum scientists a question on their web site. Good luck.
I went to school in Chicago, in the mid 60's and had a childhood friend whose father worked with the great "Bushman" at the zoo. Little is known about the "specifics" of his death, yet Jimmy would sometimes mention that Bushman had a drinking and gambling problem, while also smoking a pack and a half of "camel straights" for years.
according to a LP Zoo publication, Bushman died of heart problems