According to El País, John McAfee killed himself in jail :(
https://elpais.com/economia/2021-06-23/el-fundador-del-antivirus-mcafee-john-mcafee-se-suicida-en-una-prision-de-barcelona.html
John McAfee, November 30th 2019: "If I suicide myself, I didn't. I was whackd."