I came across this clip on the BBC website today from the Witness programme which tells the story of Jim Elliot and another 4 Christian missionaries who lost their lives in 1956 seeking to bring the good news of Jesus to an isolated tribe in Ecuador. This story had a significant impact on me as a young boy and indeed upon many more, before and since.
You can find the clip here: Killed for Christ in the Amazon
It features an interview with Valerie Shepard, the daughter of Jim & Elisabeth Elliot. You can read more about the story in Elisabeth Elliot's book Through Gates of Splendour