WASHINGTON,- U.S. President Barack Obama on Tuesday confirmed the death of Kayla Mueller, a U.S. aid worker who had been held hostage by Islamic State militants, saying the United States would "find and bring to justice the terrorists who are responsible."
Mueller's family also said in a statement that they were "heartbroken" to learn of her death and released a copy of a letter she had written in 2014 while in captivity.
The comments by Obama and the family come four days after Islamic State said Mueller, a 26-year-old humanitarian worker from Arizona, was killed when Jordanian fighter jets bombed a building where she was being held, although Jordan expressed doubt about the Islamist militant group's account of her death.
Mueller was determined to have died after her Islamic State captors privately contacted her family over the weekend, a White House spokeswoman said.
"Over the weekend, the family received a private message from Kayla's ISIL captors containing additional information," National Security Council spokeswoman Bernadette Meehan said, using an acronym for Islamic State.
"Once this information was authenticated by the intelligence community, they concluded that Kayla was deceased," Meehan said.
"Greater love has no one than this, than to lay down one’s life for her friends." Kayla Jean Mueller, 1988-2015 pic.twitter.com/jc2DEZr7Fb— Terry Moran (@TerryMoran) February 10, 2015