Kayla Mueller was a 26-year-old aid worker from Prescott, Arizona. She was not a thrill-seeker. She was the kind of person drawn toward suffering with a medical bag and a stubborn belief that people ...

Friends and family of slain ISIS hostage Kayla Mueller memorialized her at a tearful news conference in her Arizona hometown on Tuesday, just hours after her family released a statement saying the ...

ISIS said in February that Mueller, of Prescott, Arizona, was killed when Jordanian fighter jets bombed a building where she was being held outside Raqqa, a stronghold in Syria of the Islamist ...

Kayla Mueller's parents said in an exclusive interview with “Today” that despite fearing for their daughter's safety in captivity at the hands of ISIS, they were holding out hope for a reunion because ...