Pentagon says ISIS killed US hostage Kayla Jean Mueller - WAOW - Newsline 9, Wausau News, Weather, Sports

Pentagon says ISIS killed US hostage Kayla Jean Mueller

WASHINGTON (AP) - WASHINGTON (AP) -- The Pentagon says American hostage Kayla Jean Mueller died at the hands of Islamic State and not in a Jordanian airstrike targeting the militant group.

Navy Rear Adm. John Kirby was asked Tuesday if there was any doubt who killed the aid worker.

He replied: "No doubt. ISIL," using the initials the group is known by.

Kirby says U.S. officials still don't know how Mueller died. But he added that officials are certain it was not in one of the airstrikes Jordan launched in retaliation for the killing of one of its pilots.

Mueller was taken hostage in August 2013 while leaving a hospital in Syria.

ISIS said she died in the airstrike.

Her identity had been kept secret until last week out of fear for her safety.

 Meanwhile, the parents of Mueller have released a letter their daughter had written to them while being held by the Islamic State group.

In it, the 26-year-old aid worker said she was "in a safe location, completely unharmed."

Mueller also tells her parents she is "fighting" and has "a lot of fight left inside." She writes that she is "not breaking down" and "will not give in no matter how long it takes."

 In a statement, Carl and Marsha Mueller say Kayla "lived with purpose," and they pledge to "work every day to honor her legacy."

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