Why do so many people go missing in National Parks? Alien conspiracy theory? Government experiments? Orjust lost in nature? In this case- it's none of the above. It's a serial killer that leaves a trail of bloodshed and a decapitated head bobbing in a stream in Yosemite. Once they catch the killer that's when the real mystery begins - wasn't his little brother a national hero? Didn't they make TV shows about this family? How did one brother become America's sweetheart and the other America's heartless serial killer?