#13 Abu Nabil, a.k.a. Wissam Najm Abd Zayd al Zubaydi
Nabil led ISIS in Libya and was a longtime al-Qaeda figure. He was killed during a November 2015 F-15 strike targeting his compound in eastern Libya. There has been no Libyan government in effect since the toppling of Moammar Kadafi in 2011.
The Pentagon suggested Nabil may have played a key role in an execution video showing the beheading of 21 Coptic Christian Egyptians along the southern Mediterranean coast in early 2015.