What Ayman al-Zawahiri’s killing means for al-Qaeda

Ayman al-Zawahiri, the leader of al-Qaeda and one of the world’s most wanted terrorists, has been killed in a U.S. drone strike in Kabul.

The 71-year-old was largely considered the brains behind the notorious terrorist group and its vision for attacking the West — including the attacks of Sept. 11, 2001, which catapulted al-Qaeda from relative obscurity to a household name in the United States.