The Sentinelese tribe in India is believed to be one of the last people on earth without contact with the modern world, an isolated tribe that lives off the land and has fired arrows at helicopters that flew overhead.
But one American man reportedly tried to convert the tribe to Christianity and has now paid with his life.
The BBC reported that John Allen Chau wanted to preach Christianity to the uncontacted tribe, and paid fishermen to bring him to North Sentinel Island to visit them. As the report noted, the tribe has been protected by the Indian government, which made it illegal to contact the tribe, which has been so isolated that they do not have immunities to many modern diseases, like measles. It is even illegal to take pictures or video of them, and those who do try to document the tribe can get up to three years in prison, the report noted.