Since i somehow share the same opinion as you, his death is a very controversial event and probably will remain like this for long time.
"On October 9th, 1967, Ernesto "Che" Guevara was put to death by Bolivian soldiers, trained, equipped and guided by U.S. Green Beret and CIA operatives. His execution remains a historic and controversial event; and thirty years later, the circumstances of his guerrilla foray into Bolivia, his capture, killing, and burial are still the subject of intense public interest and discussion around the world."
So, yes... maybe CIA killed him using the bolivian soldiers as a weapon.
