evidence: In March 2021, following the death of Hall of Fame middleweight boxer Marvelous Marvin Hagler, rumors swirled online that the 66-year-old had died from receiving a COVID-19 vaccination. [...] The only source of the claim that COVID-19 vaccination was involved in Hagler's death came in the form of a March 13 Instagram post by Thomas Hearns, who was defeated by Hagler in a now-famous April 1985 world middleweight fight. In a post that featured a photograph of Hagler, Hearns wrote: [...] In a subsequent Instagram post that appears to have since been deleted, Hearns did not retract his claims regarding the purported role of the COVID-19 vaccine in Hagler's death, but insisted "this is not an anti vaccine campaign."