The widow of a key ISIS leader has been charged as part of a conspiracy that resulted in the death of American hostage Kayla Mueller in February 2015, the U.S. Justice Department said Monday.<br />Umm Sayyaf, also known as Nasrin As'ad Ibrahim, was captured by U.S. forces in a raid in Deir Ezzor, Syria, in May.<br />She was married to Abu Sayyaf, a senior ISIS operative, who was killed in the same raid in eastern Syria in 2015.<br />Sayyaf, 25, was charged in federal court on Monday with "conspiring to provide material support to a designated foreign terrorist organization resulting in death," the Justice Department announced.<br />Umm and Abu Sayyaf forcibly held Mueller and other female captives in several of their residences after the American was captured in northern Syria in 2013, according to the indictment.<br />Mueller was killed in February 2015.<br />At the time, ISIS said she was killed by a coalition strike.<br />The United States confirmed her death but denied it was by a coalition strike.
