evidence: Marvelous Marvin Hagler's widow says her husband's death wasn't caused by COVID-19 vaccine Thanks to misinformation spread by anti-vaxxers and a former rival, the grieving widow of boxing legend "Marvelous" Marvin Hagler felt the need to clarify that her husband's unexpected death was not caused by a COVID-19 vaccination. Kay Hagler, the boxer's wife of more than 20 years, released a statement Monday through the same Facebook fan group in which she announced her husband's death. After thanking fans for their love and supportive messages, Hagler denied speculation that the death was caused by COVID-19 vaccine complications, calling such comments "stupid" and "nonsense."