Grover Muldoon

After sparring with his roommates for about half an hour October 24, 1905, at Indianapolis, IN, USA, Grover Muldoon, age 19, a college student, began vomiting. He was taken to the hospital, where he died. Cause of death was said to be cerebral hemorrhage

Source: Death under the Spotlight: The Manuel Velasquez Boxing Fatality Collection [1]