The full truth about the bombing may have died with al Megrahi, who never provided details.
British authorities rejected that al Megrahi's release was tied to British business deals with Libya.
After the Gadhafi regime fell last year, U.S. officials renewed their call for al Megrahi's imprisonment.
Ammerman said Gadhafi's ouster and death also helped reduce some of his anger at al Megrahi's release.
After months of prosecution evidence, lawyers for Mr Al Megrahi began presenting his defence case in December.
"He was not the only person taking orders, " Cohen said of al Megrahi.
Cummock said she previously met with Blair, who told her the Scottish authorities were the ones who released al Megrahi.
He left behind at Camp Zeist his co-accused, Abdelbaset Ali Mohmed Al Megrahi, 49, who was convicted and jailed for life.
Blair said that while Libya brought up al Megrahi, no deals were ever made when he was in power to arrange for his release.
Abdelbaset Ali Mohmed Al Megrahi and Al Amin Khalifa Fhimah have been held in custody since their first appearance at the court in April.
The trial of Abdelbaset Ali Mohmed Al Megrahi and Al Amin Khalifa Fhimah is due to begin in February, under Scots Law, in the Netherlands.
Forty-nine-year-old Al Megrahi's co-accused Al Amin Khalifa Fhimah was acquitted at the same time by the court, specially convened at Camp Zeist in the Netherlands.
However, Miss de Larracoechea, speaking to BBC Scotland, said she was not satisfied with either Al Megrahi's conviction or the evidence which was heard in court.
"This is long overdue, " Zwynenburg said of al Megrahi's death.
Al Megrahi was convicted, in January this year, of mass murder over the bombing of Pan Am Flight 103 over Lockerbie in 1988, with the loss of 270 lives.
Scottish party leader Annabel Goldie said statements made to the UK government in the run-up to the release of Abdelbaset Ali Mohmed Al Megrahi gave "the impression of wanting to cut a deal".
Furor has mounted in the U.S. and U.K. over the hero's welcome given by Libya to Abdelbaset al-Megrahi, who is dying of cancer, with politicians on both sides of the Atlantic calling for an investigation into whether al-Megrahi's release was a condition of oil exploration contracts signed by Britain's BP in 2007.
Just a few days later, on August 20 2009, al-Megrahi was freed on compassionate grounds.
At the time, Scottish officials said the medical advice was that al-Megrahi would live about three months.
"Abdelbaset Ali al-Megrahi is free in the adored Libyan land, " the message read.
The same official would offer no guarantees that al-Megrahi's return would be subdued.
Scottish authorities declassified a huge trove of documents related to the case in September 2009, shortly after al-Megrahi was released.
Scottish authorities at the time cited their impression that al-Megrahi, diagnosed with terminal cancer, had only three months or so to live.
Last week, a Scottish appeal court rejected a bail application from Abdelbaset Ali al-Megrahi, the Libyan man convicted of the Lockerbie bombing.
Al-Megrahi is still alive more than a year after his release, and the story has continued to overshadow relations between Britain and Libya.
The U.S. mission quoted the British ambassador as saying that a refusal to repatriate al-Megrahi could have disastrous implications for British interests in Libya.
Abdelbaset Ali al-Megrahi is the only person to have been convicted in connection with the bombing of Pan Am flight 103 over Scotland in 1988.
Al-Megrahi is currently being held in Gateside Prison, Greenock, near Glasgow, as he serves life for killing 270 people in the 1988 Pan Am bombing.
BBC: NEWS | UK | Scotland | Fresh protest over Lockerbie row
The proposals in the second part of the bill were prompted by the case of Abdelbaset Al-Megrahi, who was convicted of murder following the Lockerbie bombing.
The Libyans were also infuriated by the U.S. government's position, that al-Megrahi should not be released and should finish his life sentence in jail in Scotland.
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