The family of slain American aid worker Kayla Mueller have released the last letter they received from her while she was in Islamic State captivity.
She told her parents she would not give in, and had found that even in prison she could be free.
The White House is paying tribute to the 26 year-old aid worker, after confirmation of her death was provided by Islamic State.
Our Washington Correspondent Simon Marks reports.
IN: "The White House…."
OUT: SOC
DUR: 37 seconds