The BBC said on its website today that Leyne had been diagnosed with an incurable brain tumour earlier this year after returning to Britain from Cairo to seek treatment for severe headaches.
Acting news director Fran Unsworth called Leyne a "brave and courageous journalist."
After joining the BBC in 1985, Leyne worked as a United Nations correspondent and was the US State Department correspondent during the September 11 attacks.
His work also took him through Europe and the Middle East. He covered the 2006 conflict between Israel and Lebanon's Hezbollah, was expelled from Iran while covering 2009 elections and most recently covered the Arab Spring.
