Carl, left, and Marsha Mueller hold candles at a memorial in honor of their daughter Kayla Mueller on Wednesday, Feb. 18, 2015, in Prescott, Ariz. Kayla Mueller's death earlier this month was confirmed by her family and U.S. officials. The 26-year-old international aid worker from Prescott had been captured in Syria in August 2013. (AP Photo/The Arizona Republic, Rob Schumacher)
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