Mohammad Najibullah Ahmadzai, commonly known as Najibullah or Dr. Najib, was an Afghan politician who served as the General Secretary of the People's Democratic Party of Afghanistan, the leader of one-party ruling Democratic Republic of Afghanistan from 1986 to 1992 and as well as the President of Afghanistan from 1987 until his resignation in April 1992, shortly after which the mujahideen took over Kabul. After a failed attempt to flee to India, Najibullah remained in Kabul. He lived in the United Nations headquarters until his death at the hands of the Taliban after their capture of the city.