Question: What is the cause of death of Rebecca Nyandeng De Mabior's husband?
Sentence (from "John Garang"): From 1983 to 2005, he led the Sudan People's Liberation Army during the Second Sudanese Civil War, and following a peace agreement he briefly served as First Vice President of Sudan for 3 weeks until his death in a helicopter crash on 30 July 2005.
Relevant evidence: Yes