The BBC was given access to the Libyan home of Abdel Baset al-Megrahi, who was found guilty of the 1988 bombing of a Pan Am flight over Lockerbie, Scotland.
In a controversial move, al-Megrahi was released from prison in 2009 on compassionate grounds. Al-Megrahi was flown to Libya and since then families and relatives of some of the 259 people who died have complained al-Megrahi was not really sick and he was let go because of politics.
But in images shown on the BBC, al-Megrahi is in a hospital bed in his home. He looks weak, as a machine monitors his heart rate.
"I want people in the UK and Scotland to see how sick my dad is," his son, Khaled al-Megrahi, told the BBC. "I want you to see my dad, he cannot move from his room."
His son also said al-Megrahi was innocent.
"I know my father is innocent and one day his innocence will come out," he said. "We feel sorry about all the people who died. We want to know who did this bad thing. We want to know the truth as well."
Last week, CNN showed images of al-Megrahi in a "comatose, near death" state. In the BBC report, today, al-Megrahi is awake.