John McAfee was an antivirus software entrepreneur who gained fame for his creation of the McAfee antivirus software. Born on September 18, 1945, he was known for his eccentric personality and controversial behavior. McAfee's impact on the world of cryptocurrency was significant, as he became a prominent figure in the space, promoting various cryptocurrencies and claiming to be able to make significant daily profits. However, his life was marred by legal troubles, including accusations of tax evasion and involvement in a wrongful death lawsuit. On June 23, 2021, McAfee was found dead in his prison cell in Spain, an apparent suicide, just hours after his extradition to the United States on tax-related charges was approved. His death sparked conspiracy theories and added to the controversial legacy of a man who had made a significant impact in the realm of cybersecurity and cryptocurrency.