Faull was found dead on Sunday morning on the second story of his home with a gunshot to the back of his head. There was no sign of forced entry, and police found a 9 mm casing at the scene. Faull's laptop and iPhone were missing.
McAfee brushes off reports that he is insane. Recent photos have surfaced showing the former software tycoon pressing a pistol to his temple and totting a shotgun. McAfee says the media has portrayed him as gun-obsessed.
"I've never seen myself walking around shirtless carrying a shotgun, what an absurd thing to do," McAfee said. "… I would walk around armed, but mostly with a pistol in a holster and wearing clothes for god sake."
McAfee is best known for developing anti-piracy software in the 1980s and helping to pioneer instant messaging in the 1990s. He sold his shares in the software company that bears his name in 1994 and pocketed $100 million. After losing all but $4 million of his fortune, he moved to Belize five years ago.
ABC News' Mark Shone contributed to this report.