Al-Qaida's publicity arm recently announced that Ayman al-Zawahiri, Osama Bin Laden's longtime deputy, has officially taken the reins of the terrorist organization following Bin Laden's death. Al-Zawahiri has appeared on the Most Wanted Terrorists list since it was first compiled in 2001 in response to the 9/11 attacks. The FBI is currently offering $25 million to anyone who can provide evidence that will lead to his capture.

While U.S. and allied forces have killed or detained hundreds of suspected terrorists who have come onto their radar since Sept. 11, 2001, al-Zawahiri is one of the last major figures directly involved in the 9/11 attacks who is still at large. This interactive traces the fates of the 18 men Slate has identified as most responsible for the assault, based on the 9/11 Commission Report and a wide variety of contemporary news stories. (Hijackers are not included.) To view the information, you can choose to sit back and hit "Autoplay" or click through the slides at your leisure.