The door must have been locked from outside, by the killer. So there are only two possibilities either it was Joseph Barnett or it was a previous customer who took the key with him on the last occasion he visitied. Joseph was telling the police that the key was lost around October 30th, when they separated.
Interesting is also that Cox saw Mary enter with a blotchy-faced stranger, but no mention that she reached throught the window to open the door for her customer. So the third possibilty would be that Mary kept the key and hid it from Joe, and the killer took it when he left to lock the door from outside.
Interesting is also that Cox saw Mary enter with a blotchy-faced stranger, but no mention that she reached throught the window to open the door for her customer. So the third possibilty would be that Mary kept the key and hid it from Joe, and the killer took it when he left to lock the door from outside.
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