From a New York Times obit by Douglas Martin and Alan Cowell headlined “Killed at 71, Ayman al-Zawahri Led a Life of Secrecy and Violence”:

Ayman al-Zawahri, the Egyptian-born surgeon-turned-jihadist who assumed the leadership of Al Qaeda after the killing of Osama bin Laden and who died at 71 in a drone strike in Kabul, Afghanistan, over the weekend, according to U.S. officials, led a life steeped in secrecy, betrayal, conspiracy and violence, most murderously in the Sept. 11 attacks against the United States in 2001.