Vermont State Police have charged a Poultney man with second-degree murder in the death of his 2-year-old stepdaughter. Dennis Duby, 31, was being held in lieu of $250,000 bond after being charged Saturday in the death of Dezirae Sheldon, authorities said. The toddler died Friday at Dartmouth-Hitchcock Medical Center in Hanover, N.H., — two days after she was brought to a Vermont hospital emergency room with head injuries. An autopsy by the New Hampshire medical examiner’s office determined that Dezirae died of blunt trauma injuries to the head. Duby was scheduled to be arraigned Monday in Rutland Superior Court. It was not immediately known whether he had a lawyer.