Originally Posted by Bridewell
A few random observations following on from the above:
It would have been invaluable for the killer of Chapman to know that the room six feet away was unoccupied on that particular night. If the door was locked from the outside, someone was in possession of the key. The fact that the door was locked in the morning does not preclude the possibility of its being opened and re-locked during the night. Could the cellar only be accessed from the yard or was there an internal access also - if so where was it?
No idea about the cellar, but would presume Mrs Richardson had the padlock key. She does say that she locked the back parlour and took the key with her, so realistically only her or her grandson could have had access, and she was awake half the night.