Beyond the Gates of Splendor (also Beyond the Gates) is a feature-length documentary film that was released in 2004. It chronicles the events leading up to and following Operation Auca, an attempt to contact the Huaorani tribe of Ecuador in which five American missionaries were killed. The film was produced by Bearing Fruit Productions and distributed by Every Tribe Entertainment.

Based on that paragraph can we conclude that this sentence is true?
Only four American missionaries were killed during Operation Auca by the Huaorani tribe because the fifth one fell off a cliff in Ecuador.
It's impossible to say