Al-Baghdadi operation named after Kayla Mueller. Who was she?
"Well, it's a roller coaster of emotions whenever this ugly situation raises its head, but it's become part of our life over the last five and a half years," Kayla's father, Carl Mueller, told CNN.
Eric Mueller reads a poem about his late sister aid worker Kayla Mueller at the Prescott's Courthouse Square in Prescott, Arizona, February 18, 2015. Friends and colleagues of Mueller, the aid worker who died while a captive of militants of the Islamic State group in Syria, remembered her on Saturda(photo credit: REUTERS/DEANNA DENT)ByRACHEL WOLF, EZRA TAYLOR
