A serial bank robber is responsible for a recent heist in Hoover, authorities said. Myron William Ernst robbed a Regions branch on Highway 31 last month, investigators said. He is also suspected in other bank robberies across Alabama, and in other states. The FBI says the crook gives tellers a note demanding money, while telling them he has a gun. Anyone with information on Ernst's whereabouts is asked to call the FBI at (251) 438-3674.