American ISIS hostage Kayla Mueller is dead, the aid worker's family and the White House have stated. The announcement came four days after ISIS claimed the 26-year-old Arizona native had been killed by a coalition airstrike in Syria. 'We are heartbroken to share that we've received confirmation that Kayla Jean Mueller, has lost her life,' Mueller's parents, Carl and Marsha, and brother Eric, said in a statement. 'We are so proud of the person Kayla was and the work that she did while she was here with us. She lived with purpose, and we will work every day to honor her legacy.' Pictured: May 30, 2013 - Prescott, Arizona, U.S. - (File) KAYLA MUELLER works for Support to Life in Turkey and spoke to the Prescott Kiwanis Club about the situation in Syria and efforts to build a second camp for Syrian refugees in Turkey. (Credit Image: © Matt Hinshaw/The Daily Courier/
iMatt Hinshaw/The Daily Courier/ZUMA

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