For decades he carved out a career playing unshakable villains. But RadarOnline.com can reveal booming-voiced James Earl Jones spent his final years rattled by his battle with type 2 diabetes. The hard man of cinema, famed for his thunderous baritone, was shaken to his core when he was stricken with the disease, the diagnosis of which he was struck him “like a thunderbolt” A rep for the actor, who was best known for voicing Darth Vader in Star Wars and Mufasa in Disney’s The Lion King, confirmed he died Monday at his home surrounded by family. His cause of death has not been announced at this …