The following quotes are from 'In the Line of Fire: A Memoir' by Pakistan's President Pervez Musharraf.
"Omar Sheikh is a British national born to Pakistani parents in London on December 23, 1973. His early education was in the United Kingdom, although he spent four years at Lahore’s prestigious Aitcheson College. He then went to the London School of Economics (LSE) but dropped out before graduation. It is believed in some quarters that while Omar Sheikh was at the LSE he was recruited by the British intelligence agency MI-6. It is said that MI-6 persuaded him to take an active part in demonstrations against Serbian aggression in Bosnia and even sent him to Kosovo to join the jihad. At some point he probably became a rogue or double agent. On his return from Bosnia he came to Afghanistan and met Maulana Abdul Jabbar, who guided him to Khost in Afghanistan to be trained not in religion but in guerilla warfare." Page 225
"In July 2002, an antiterrorism court in Pakistan gave Omar Saeed Sheikh the death penalty. The case is currently on appeal. Daniel Pearl’s murder was one of the many terrorist acts in Pakistan after 9/11, but it was particularly gruesome." Page 228