Al-Azhar Sheikh Dr. Mohammed Sayyed Tantawi, died in Riyadh this morning as a result of an heart attack. The Middle East News Agency "MENA" said that Al-Azhar Sheikh had suffered from a severe heart attack at King Khalid International Airport in Riyadh while leaving for Cairo, noting that he was transferred immediately to the hospital where he passed away. Dr. Tantawi arrived in Riyadh on Tuesday to participate in the award-giving ceremony of King Faisal International Prize.