British-born al-Qaeda leader Ahmed Omar Saeed Sheikh and his three aides, whose release in the abduction and murder case of US journalist Daniel Pearl was ordered by a court here, would walk out of the prison on Saturday as their release orders were received very late. A Pakistani court on Thursday ordered the release of Sheikh and his three aides– Fahad Naseem, Salman Saqib and Sheikh Adil– who were convicted and sentenced in the case.