Keep the River on Your Right: A Modern Cannibal Tale (2000)

In 1955, while a Fulbright scholar, a Manhattan painter named Tobias Schneebaum spent seven months in the Amazon basin with the Harakambut. When he returned to the US, he could no longer paint. What happened? Nearly 45 years later, filmmakers want Tobias, now 78 and suffering from Parkinson's, to return to Peru. He refuses but allows that he will revisit the Asmat in New Guinea where he spent an idyllic time years before. That trip goes well, including a serendipitous meeting with Aipit, an aging native and once Tobias' friend and lover. Tobias then agrees to go to Peru to look for the people whom he joined on a murderous raiding party. The scars of war remain as does fear.