With the confirmed death of Miss Kayla Mueller, new details have emerged about the American hostage's experience in Islamic State in Iraq and Syria (ISIS) captivity, including the belief by some officials that she had been given over to a commander in the group.
"ISIS didn't see her as a hostage or a bargaining chip," a counter-terrorism official told ABC News.
Her ordeal has also been captured in a letter she wrote to her family.
The limited intelligence from Syria indicated that Miss Mueller was sometimes in the company of an ISIS leader who was being actively tracked and who had custody over her, possibly by forced marriage, officials told ABC News.
Sometimes the 26-year-old was with her ISIS keeper and other times she was not, two officials said.
Miss Mueller was confirmed to have died under circumstances that remain unclear about 18 months after she was abducted.
The White House said her family received a message from her captors containing information that was authenticated by US intelligence analysts who verified her death.
President Barack Obama also acknowledged in an interview with news website Buzzfeed that Miss Mueller was among the hostages whom US commandos were sent to rescue but failed to find in an operation he ordered last year.
The Arizona native, who was taken hostage in August 2013, took strength during captivity in her faith in God and the love of her family, she wrote in a letter relatives released on Tuesday.
"I have been shown in darkness, light + have learned that even in prison, one can be free," said a handwritten letter by Miss Mueller which was smuggled out by fellow captives following their release.
The humanitarian aid worker was driven by an unquenchable passion to help others, saying that service to others brought her closer to God.
In the letter, she said she managed to find glimmers of joy, even in captivity, AFP reported.
"I have come to see that there is good in every situation, sometimes we just have to look for it," she wrote in the letter received by her relatives early last year.