Abdelbaset al-Megrahi 10 August 2009 that he had terminal prostate cancer. On his return to Libya, al-Megrahi was initially hospitalized then allowed to leave on 2 November 2009, taking up residence in a villa in Tripoli. He died on 20 May 2012, two years and 9 months after his release. Several legal experts as well as the UN observer at the Lockerbie trial have vehemently challenged the verdict that convicted Megrahi, while Ulrich Lumpert, the Mebo AG engineer who testified to the validity of a key piece of evidence, admitted in an affidavit to lying in court and stealing the object from
Hans Köchler's Lockerbie trial observer mission of the doctrine of international law. In September 2008, following a meeting organised by the Lockerbie Justice Group at Greshornish House on the Isle of Skye, Köchler and Professor Robert Black called for a new public inquiry into the Lockerbie bombing. Köchler said:"Irrespective of the outcome of the current appeal, there should be a reinvestigation of the incident by the Scottish authorities. It is extremely frustrating that with regard to such an incident just one person has been presented as the culprit and no further questions asked. Only a child would believe such a story." During Köchler's visit to Scotland,