Former UN Secretary-General Kofi Annan, the first black person to head the organisation, died in the Swiss city of Bern after a short illness.
The Ghanaian career diplomat served as chief of the organisation between 1997 and 2006, having been elected to head the organisation twice.
Annan joined the UN in 1962 after studying management at the Massachusetts Institute of Technology and worked his way up the UN hierarchy.
He eventually rose to become the head of the UN’s peacekeeping efforts before assuming the top organisation’s top job.
World leaders, past and present, reacted to the news of his death after it was announced on Saturday.