 However, Libya's militarily weak regime was eventually overcome, and Gaddafi was killed on October 20, 2011, leading to the disintegration of the regime.Since Gaddafi's departure, tribal elders, NGOs, youth groups, town councils, and local brigades have stepped in to fill the power vacuum.There are many different tribes in Libya, not all of which have supported the regime change, making the establishment of a new form of legitimacy difficult.