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Washington • The wife of a senior Islamic State leader who was killed in a U.S. raid last year has been charged in federal court with holding American Kayla Mueller hostage and with contributing to the aid worker's death, the Justice Department said Monday.

Nisreen Assad Ibrahim Bahar, also known as Umm Sayyaf, 25, admitted after her capture in May that she and her husband kept Mueller captive along with several other young female hostages, according to an FBI affidavit filed in the case. U.S. officials have said that while in custody, Mueller was repeatedly forced to have sex with Abu Bakr al-Baghdadi, the leader of the Islamic State.

The criminal complaint, filed in federal court in Virginia, charges Umm Sayyaf with conspiracy to provide material support to a foreign terror organization, resulting in death.

The case comes one year after Mueller was confirmed dead by her family and the Obama administration, though it's not clear when or if Umm Sayyaf will be brought to the U.S. to stand trial. The Iraqi woman, who was captured last year, is in Iraqi custody and facing prosecution there. Her husband, Abu Sayyaf, a former Islamic State minister for oil and gas, was killed in May in a Delta Force raid of his compound.

Mueller, of Prescott, Arizona, was taken hostage with her boyfriend, Omar Alkhani, in August 2013 after leaving a Doctors Without Borders hospital in Aleppo, Syria, where he had been hired to fix the Internet service for the hospital. Mueller had begged him to let her tag along because she wanted to do relief work in the war-ravaged country. Alkhani was released after two months, having been beaten.

A Yazidi teenager who was held with Mueller and escaped in October 2014 said al-Baghdadi took Mueller as a "wife."