John Miller on vacation near San Francisco | Courtesy Alicia Miller IDAHO FALLS — A devoted father, a diehard Colts fan and a simple man, John Gilpin Miller, editor of the Post Register, passed away Tuesday at his home at the age of 65. Travis Quast, regional president of Adams MultiMedia East Idaho and publisher of the Post Register, said Miller’s passing surprised all of them. “It just really hasn’t sunk in,” Quast said.