Mustafa Khalil, a former Egyptian prime minister who was an architect of the 1979 Camp David peace treaty between Egypt and Israel, has died. He was 88. Khalil died late Saturday in a Cairo hospital, where he was being treated for an unspecified illness, the Egyptian state news agency, MENA, said. Khalil - then secretary-general of the ruling Arab Socialist Union part - accompanied late president Anwar Sadat in his historic visit to Jerusalem in November 1977. The visit paved the way for the negotiations mediated by then-US president Jimmy Carter. Khalil, who serves as prime minister from 1978-1980, then headed the Egyptian team in negotiations with the Israelis at Camp David, which ended with the 1979 peace deal, the first between an Arab nation and Israel.