Anti-virus software pioneer John McAfee was reportedly rushed to a Guatemala hospital after his request for political asylum in the country was rejected.
McAfee, 67, who faces deportation to Belize for questioning over the death of his neighbour there, was brought out of an immigration service detention centre on a stretcher.
Early reports suggested he was had suffered two mild heart attacks, but his lawyer Telesforo Guerra said he had been suffering from stress and hypertension, The Telegraph reports.
"He never had a heart attack. Nothing like that," Mr Guerra said in Guatemala City. "I'm not a doctor. I'm just telling you what the doctors told me. He was suffering from stress, hypertension and tachycardia (an abnormally rapid hearbeat)," his lawyer said.
According to the paper, he was released from hospital several hours later.
The former tycoon had earlier been detained at Guatemala City's Intercontinental Hotel for entering the country illegally from Belize, the paper said.
He had been on the run for more than three weeks after refusing to speak to authorities in Belize about the death of Gregory Faull, an American who was shot dead in early November, it added. (ANI)