article_snippet: Kayla Mueller, 26, was captured in August of 2013 after leaving a Doctors Without Borders hospital in Aleppo, Syria, and held for 18 months.
article_snippet: It is believed International aid worker was killed by Jordanian airstrikes targeting ISIS in Raqqa last month.
article_snippet: Kayla was captured by ISIS in August of 2013 in Aleppo, Syria and held for 18 months before being killed .
article_snippet: (right) ISIS released images of a badly-damaged building in which they claimed Kayla had been killed by an airstrike .
article_snippet: Kayla death was confirmed Feb. 10 by Kayla family and US officials.
article_snippet: Kayla is the fourth American to die while being held by ISIS.
highlights_snippet: Kayla Mueller, 26, was captured by ISIS in August of 2013 in Aleppo, Syria .
  
highlights_snippet: Was held for 18 months before being killed last month, likely by airstrike .
  