Kayla Mueller: New Details Emerge About ISIS Captivity

US officials suspect she was given over to ISIS commander before death.
2:13 | 02/11/15

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Transcript for Kayla Mueller: New Details Emerge About ISIS Captivity
emergency in new England, with another storm coming. But first, the breaking news. Kayla Mueller, the final American hostage, these new images tonight. 26 years old, and now come questions about what happened in her final months with Isis. Her family speaking out tonight, sharing details from a handwritten letter she sent to her parents while she was in captivity. They've now revealed what she wrote. ABC's chief investigative correspondent Brian Ross tonight. Reporter: Heartbreak today for Kayla mule earl's family, friends and country after Isis sent her parents what has been accepted as visual proof that she is, in fact, dead. I'm not yet sure how to live in a world would Kayla. But I do know that we're all living in a better world because of her. Reporter: Her family says it wents these foe tomes to be how she is remembered. Released today, along with a letter her daughter smuggled out a year ago. 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. Kayla has touched the heart of the world. The world grieves with us. The world mourns with us. Reporter: With Mueller's death now confirmed, people involved in trying to rescue her told ABC news today they had been tracking a senior Isis leader who had been given her as a kind of bride or reward. The 26-year-old Arizona native went to Syria with a Syrian boyfriend to work with war refugees. I am in solidarity with the Syrian people. Reporter: In her smuggled letter to her family, she described her captivity. Please know that I am in a safe location, completely unharmed, healthy. I have been treated with the utmost respect, kindness. But Mueller still had the determined spirit that had led her to Syria in the first place. Know I am also fighting from my side in the ways I am able. I have a lot of fight left inside of me. I am not breaking down. I will not give in, no matter how long it takes. President Obama said today that Kayla Mueller represents what is best about America. And he vowed to bring to justice the terrorists who he said were responsible for her captivity and death, no matter how long it takes.

This transcript has been automatically generated and may not be 100% accurate.

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