Anti-virus software founder John McAfee returned to the United States on Wednesday after he was released from detention in Guatemala.

Johan Ordonez / AFP - Getty Images

US anti-virus software pioneer John McAfee is transferred to the Aurora international airport in Guatemala City, Dec. 12, 2012.

Guatemalan immigration officials escorted McAfee, 67, to the Guatemala City airport, where he boarded a flight to Miami.

"I'm free, I'm going to America," he said.

John McAfee hospitalized in Guatemala due to heart attacks, lawyer says

McAfee is wanted for questioning in Belize over the murder of a neighbor. He had been held for a week by immigration officials in Guatemala, where he surfaced after evading Belizean officials for nearly a month.

McAfee -- famous for the anti-virus software that still bears his name -- crossed into Guatemala with his 20-year-old girlfriend to evade authorities in Belize, who want to quiz him as "a person of interest" about the killing of fellow American Gregory Faull.

One of Silicon Valley's first entrepreneurs to build an Internet fortune, McAfee made millions of dollars through antivirus software.

McAfee's behavior has been increasingly erratic in recent years but there is no international arrest warrant for him. Police in Belize say he is not a prime suspect.

The Associated Press and Reuters contributed to this report.

More world stories from NBC News:

• Pope Benedict sends his first tweet
• ANALYSIS: 'Spoiled child' North Korea snubs key ally China with rocket test
• ANALYSIS: Egypt is rapidly approaching its own 'cliff'
• Nelson Mandela suffers recurrence of lung infection
• Banking giant HSBC to pay record $1.9 billion in money-laundering case
• Suspect in US envoy's killing in Libya arrested in Egypt
• Cuba's jailing of American contractor 'arbitrary,' UN panel concludes
• Nearly 900 left missing by Typhoon Bopha in the Philippines
• Video: Penguins in Tokyo take over as Santa's elves

Follow World News from NBCNews.com on Twitter and Facebook