WASHINGTON - US aid worker and hostage Kayla Mueller was determined to have died after her Islamic State captors reached out privately to her family over the weekend, a White House spokeswoman said on Tuesday."Over the weekend, the family received a private message from Kayla's ISIL captors containing additional information," 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."
