President Vieira was shot to death by army troops in March 2009. The assassination was said to be in retaliation for an earlier bomb attack that killed the army chief of staff, Gen. Batista Tagme Na Wai, which troops blamed on the president. The military denied a coup attempt.
In June presidential elections, former acting president Malam Bacai Sanha took 39.6% of the vote, former president Kumba Iala 29.4%, former interim president Henrique Rosa 24%, and Iaya Djalo 3.1%. Sanha prevailed over Iala in the July run-off election, winning 63% of the vote.
In Jan. 2012, Sanha died unexpectedly, leaving Guinea-Bissau leaderless. Acting president Raimundo Pereira and acting prime minister Adiato Diallo Nandigna were removed in a coup on April 12. A transition president, who may rule up to 2 years, was announced on April 20: Manuel Serifo Nhamadjo, who came in third place in the first round of the presidential election in March. He named Rui Duarte de Barros to be transitional prime minister. The National Transition Council, which will oversee the transition, will be headed by Braima Sori Djalo. Six weeks after the coup, the military junta returned power to the civilian government.