eight o'clock
_ She found the hall door locked and bolted , as the butler left it at half-past ten the night before . _ ` One of the household , therefore , must have been out , and returned after the witness Rebecca had gone back to her room . ` Putting these facts together , it is clear that the only possible authors of the crime subsequently discovered must have been the butler , who had a latchkey , and prisoner . ` At eight o'clock the witness Rebecca came down and took two jugs of hot water to the ladies ' doors . She knocked at each . She heard a faint reply from prisoner , but none from deceased 's room . ` At half-past eight prisoner usually came down , and deceased was generally seen a few minutes after .