relatives shared an alert she wrote during captivity, john terrett has more. >> reporter: kayla muller wrote this letter to her family in the spring of last year. she'd been held by i.s.i.l. since august 3rd, 2013. abducted on her way to a bus station, after spending a night in aleppo. her fellow captives delivered the letter to her family after they were released. she wrote: muller went on to say: she expressed an unwavering faith in god, writing: in prison what we see from that letter is that she continued to be free. >> and optimistic.