Economy Cut off from the world, the island in Andaman and Nicobar where an American was killed remains a mystery Updated : November 23, 2018 11:39 AM IST Police say that is what happened last week when a young American, John Allen Chau, was killed by islanders after paying fishermen to take him to the island. Scholars believe the Sentinelese migrated from Africa roughly 50,000 years ago, but most details of their lives remain completely unknown. Many of the island chain's other tribes have been decimated over the past century, lost to disease, intermarriage and migration. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.