In this May 30, 2013, photo, Kayla Mueller is shown after speaking to a group in Prescott, Ariz. A statement that appeared on a militant website commonly used by ISIS claimed that Mueller was killed in a Jordanian airstrike on Friday, Feb. 6, 2015, on the outskirts of the northern Syrian city of Raqqa, the militant group's main stronghold. (AP Photo/The Daily Courier, Jo. L. Keener )