The Islamic State is claiming kidnapped aid worker Kayla Mueller, its last known remaining American hostage, has died in Syria. On Friday, ISIS claimed Mueller was killed in a Jordanian airstrike on the city of Raqqa. Mueller’s family says it has yet to see proof and maintains hope she is still alive. Jordan has dismissed the ISIS claim as a PR stunt, and the United States has not confirmed her death. Mueller disappeared in August 2013, but her kidnapping was not publicly revealed until Friday’s announcement. Mueller reportedly moved to the Turkish-Syrian border in late 2012. She had previously traveled to the Middle East to work with the International Solidarity Movement in the Occupied Territories. Mueller graduated from Northern Arizona University in 2009. In Mueller’s hometown of Prescott, Arizona, a family spokesperson paid tribute to her aid work overseas.

Dr. Todd Geiler: “This was part of a life plan and a life path for her. She has gone down this, helping others, being a humanitarian. It was something in her heart that she went on ahead and ingrained early in her childhood and has carried through as she has matured into a young lady. Her final quote before she left was: 'For as long as I live, I will not let this suffering be normal. I will not let this be something we just accept.' It defines the young lady when she was in her adolescence, and it defines her as a woman today.”