Rockefeller’s death was eventually ruled a drowning, but there have long been questions about the official version of events. A book published in 2014 by Carl Hoffman claims that there is ‘clear and abundant’ evidence that Rockefeller made it to shore and was killed and ceremonially eaten by the tribesmen. Rockefeller had also been studying the before he vanished and the two closely-linked tribes inhabit the same region of Indonesia.