Wife of killed Islamic State leader now in Iraq custody

1	Umm Sayyaf, wife of the Islamic State's head of oil operations Abu Sayyaf, was in U.S. custody since May 15.
2	There have been suggestions that she and her husband were the captors of American hostage Kayla Mueller, who was believed held in Syria.
3	Mueller was killed while being held prisoner.
4	Islamic State militants have claimed she died in a Jordanian airstrike, but U.S. and other officials have cast doubt on that assertion.
5	Mueller, who was from Prescott, Arizona, and her Syrian boyfriend were taken hostage in August 2013 after leaving a Doctors Without Borders hospital in Aleppo, Syria.
6	The boyfriend was later released.
7	U.S. officials have said Umm Sayyaf, an Iraqi, was cooperative while being detained by the U.S. in Irbil.
8	They said she provided a "trove" of intelligence about Islamic State operations.
9	She was transferred to the custody of Kurdish officials in Iraq.
10	Abu Sayyaf was killed during a U.S. Army Delta Force raid on a compound in Syria.
11	He was the head of oil operations for the Islamic State.