Population Zero(2016)

Overview:

In 2009 three young men were killed in a remote part of Yellowstone National Park. Authorities never found the murderer. He found them! Hours after the trio were gunned down, Dwayne Nelson confessed to the crime. Despite this Nelson was allowed to go free because of an American Constitution loophole. Documentarian Julian T. Pinder travels to Yellowstone in a compelling chase for truth behind a crime that should have rocked the nation. How did a guilty man go free? In his hunt for answers Pinder risks his own life when he finds evidence that could re-open the case years later.