"The Girl Left Behind"
The story of Kayla Mueller’s torture and death at the hands of ISIS is a devastating one.
According to the NY Daily News, Kayla traveled to Aleppo, Syria, in 2013 with her boyfriend, Omar Alkhani, to help install hospital equipment. Alkhani was a contractor for the humanitarian organization, Doctors Without Borders, and Kayla had worked for a refugee charity in Turkey since 2012.
On the trip, Kayla was kidnapped by ISIS. For 18 months, she was reportedly tortured and raped by the terror group. She was even forced into sex slavery with ISIS leader Abu Bakr al-Baghdadi.
Preview video of the 20-20 story airing on Friday, August 26, 2016 on ABC News: