These are the top 10 most mysterious deaths of African presidents. 10 African leaders died in office between 2008 and 2012 compared to only three in the rest of the world.

Two of those African leaders, Guinea-Bissau’s Joao Bernardo Vieira and Libya’s Muammar al-Qaddafi, died under not so peaceful circumstances. But in 2012 alone, the presidents of Ethiopia, Ghana, Malawi, and Guinea-Bissau (a different president, Malam Bacai Sanhá) died in office of natural causes. All had suffered from mysterious ailments and had denied rumors about their ill health prior to their deaths.

1Levy Mwanawasa, 59

(3 September 1948 – 19 August 2008) was the third Republican President of Zambia. He ruled the country from January 2002 until his death in August 2008.

Mwanawasa is credited for having initiated a campaign to rid the corruption situation in Zambia during his term.

Prior to Mwanwasa’s election, he served as vice-president from 1992 to 1994 whilst an elected Member of Parliament of Chifubu Constituency. He was the president of Zambia till August 2008, when he died of a stroke.