Aug 20: Lockerbie bomber Abdel Baset al-Megrahi holds his prisoner release papers as he walks up stairs to board an airplane in Scotland.
Aug. 20: Abdel Baset al-Megrahi, left, is greeted by the son of the Libyan leader Seif al-Islam Qaddafi on his arrival at an airport in Tripoli.
Aug. 20: Libyan Abdel Baset al-Megrahi is helped down the airplane steps on his arrival at an airport in Tripoli, Libya.
Aug. 30: Al-Megrahi is seen in a hospital bed in Tripoli in this image taken from TV from footage by Britain's Channel 4 News.
The Lockerbie bomber is at the center of a fresh row after it emerged he is taking a cancer drug that could keep him alive for five more years, The Sun reported.
Terminally ill Abdelbaset Ali al-Megrahi was prescribed chemotherapy treatment Taxotere after returning to Libya.
But on Sunday it was reported he wasn't given the drug while he was in Greenock prison in Scotland - amid claims he could have been kept behind bars if he had taken the medication.
Opposition justice spokesman Bill Aitken has demanded answers from Justice Secretary Kenny MacAskill.
He said: "Was the existence of a drug which is reportedly now extending the life of the Lockerbie bomber included in any of the reports Kenny MacAskill read before making the decision to release him?
"Alex Salmond's government is still refusing to publish the independent advice upon which they based their decision."
Megrahi - sentenced to life for the 1988 jet bombing that killed 270 people - was freed on compassionate grounds seven months ago and returned home to Libya.
On Sunday, it emerged the prostate cancer sufferer's condition has now stabilized.
A source close to the 57-year-old said: "After his treatments, he can be unwell for two or three days but then enjoys a period when he's quite well."