The first president of Bangladesh, Sheikh Mujibur Rahman, and most of his family were killed during the early hours of 15 August 1975 by a group of Bangladesh Army personnel who invaded his Dhanmondi 32 residence as part of a coup d'état. Minister of Commerce, Khondaker Mostaq Ahmad, immediately took control of the government and proclaimed himself president. The assassination marked the first direct military intervention in Bangladesh's civilian administration-centric politics. 15 August is National Mourning Day, an official national holiday in Bangladesh.

Sheikh Mujibur Rahman, popularly known by the honorific prefix Bangabandhu, was a Bangladeshi politician, revolutionary, statesman, activist and diarist. As a politician, Mujib had held continuous positions either as Bangladesh's president or as its prime minister from April 1971 until his assassination in August 1975. Mujib successfully led the Bangladeshi independence movement and restored the Bengali sovereignty after over two centuries following the Battle of Plassey in 1757, for which he is honoured as the 'Father of the Nation' in Bangladesh. In 2011, the fifteenth constitutional amendment in Bangladesh referred to Sheikh Mujib as the Father of the Nation who declared independence; these references were enshrined in the fifth, sixth, and seventh schedules of the constitution. His Bengali nationalist ideology, socio-political theories, and political doctrines are sometimes called Mujibism.