Not surprised
I had a tour of the prison in Belize City in 1990, when I visited the British Army garrison there (it's a tour they gave to all squaddies posted out there). Absolutely shocking conditions. There was one inmate there who had both legs amputated. He told us that he had one leg when he was sent down, but lost the second leg after a knife fight in the prison.
Terrifying to think about a long stretch in there, no wonder McAfee had a heart attack.