Abubakar Shekau (; born between 1969 and 1975), also known by his alias Darul Tawheed, is a Nigerien Islamist terrorist. He was the Emir of the Nigerian militant group Boko Haram. He served as deputy leader to the group's founder, Mohammed Yusuf, until Yusuf was killed in 2009. He was said to have been also killed in 2009 until a video in July 2010 appeared, with Shekau being called the new leader of the group.