For a moment, forget about our new president’s vow to hunt and capture or kill Osama Bin Laden. What if it’s already been done? In Chicago-bred author George Matheos’ new book, “The Man Who Killed Osama,” the novel’s protagonist, Jake Darren, kills Osma Bin Laden twice. (Bin Laden is actually killed a total of four times during the course of the book.) “The basic assumption of the book is that most Americans, if not most of the world, would love to see Osama killed-many times over,” Matheos says. Matheos’ idea for the book was inspired by numerous news reports that surfaced every so often that Bin Laden might have been dead. “The intention was not to write a book about Osama per se but of the circumstances of his death,” says Matheos. “What would an average American from Chicago do if he had the opportunity to kill Osama?”