Authorities in Georgia are searching for suspects in the shooting death of a gun enthusiast and weapons expert who managed a popular YouTube channel showcasing high-powered guns and explosives. Keith Ratliff, 32, who helped operate FPSRussia firearms channel on YouTube, was found dead inside his Carnesville, Ga., office on Jan. 3 from a single gunshot wound to the head. The man's death is being investigated as a homicide, Mike Ayers of the Georgia Bureau of Investigation confirmed to FoxNews.com. "He [Ratliff] did sustain a gunshot wound that was not self-inflicted," Ayers said, adding that "robbery does not appear to be...