whodunnit/

I think it was one of the organization that existence of Che harms them. One can be the opponents of Che in Cuba, who does not agree with his idea that all communist/socialist goverments must give out everything for third world nations. it can also be the people in the third world nation that does not like his involvement in their ground. On the other hand, it could be the person who thinks that his people were abandoned by him, such as his past soldiers, or other people who were surprised at his change. For the last possibility, it can be the United States secret organization that believes he will harm the United States directly/indirectly.