According to new information, fellow hostages are now speaking up about the kind of woman Mueller was: "She was always considerate of others, even though she herself was in a very difficult situation," Frida Saide, one of three women from Doctors Without Borders who shared a cell with Mueller said. 

"She was always concerned for other prisoners. She never stopped being concerned for the Syrian population living through just horrible things in this war and still are. She never stopped caring for others." 

Mueller was kidnapped by the Islamic State in 2013. After a furious email exchange, ISIS told her parents she was alive in 2014, but then airstrikes hit. Her death was announced in February 2015. 

Despite rape, torture and further unthinkable abuse, Mueller's fellow hostages say she refused to deny Christ and even witnessed to [the infamous] Islamic State executioner Jihadi John, who was dubbed one of "The Beatles."

"One of the Beatles started to say, 'Oh, this is Kayla, and she has been held all by herself. And she is much stronger than you guys. And she's much smarter. She converted to Islam.' And then she was like, 'No, I didn't,'" Former hostage Daniel Rye Ottosen, a Danish freelance photographer, told ABC News. (Photo via Mirror UK)

After her death, her parents released a letter a freed hostage had smuggled out:  

Everyone, if you are receiving this letter it means I am still detained but my cell mates (starting from 11/2/2014) have been released.

I have asked them to contact you + send you this letter.

It's hard to know what to say.

Please know that I am in a safe location, completely unharmed + healthy (put on weight in fact); I have been treated w/ the utmost respect + kindness. I wanted to write you all a well thought out letter (but I didn't know if my cellmates would be leaving in the coming days or the coming months restricting my time but primarily) I could only but write the letter a paragraph at a time, just the thought of you all sends me into a fit of tears.

If you could say I have "suffered" at all throughout this whole experience it is only in knowing how much suffering I have put you all through; I will never ask you to forgive me as I do not deserve forgiveness.

I remember mom always telling me that all in all in the end the only one you really have is God. I have come to a place in experience where, in every sense of the word, I have surrendered myself to our Creator b/c literally there was no else ... + by God + by your prayers I have felt...

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