The antivirus pioneer reportedly killed himself on Wednesday just hours after it was announced he would be extradited to the United States.
The 75-year-old tech mogul is reported to have taken his own life in prison in Barcelona, according to local paper El Pais.
In his tweet two years ago, McAfee appeared to show off a tattoo reading "whackd" as he accused US officials of targeting him.
"Getting subtle messages from U.S. officials saying, in effect: 'We're coming for you McAfee! We're going to kill yourself'," he wrote.
"I got a tattoo today just in case. If I suicide myself, I didn't. I was whackd. Check my right arm."
He alleged he had dirt on “those in power” and threatened to finally expose “the truth” if he was jailed or died.
And he claimed he had set up a “deadman switch” to spill untold dirt on unnamed people if he were to die or disappear mysteriously.
RIP McAfee. He was a legend for infecting nearly every Windows 95 computer with McAfee Anti-Virus and later his far out lifestyle. Will be interesting to see if any "dirt" he allegedly had on people materializes.