When Andrew returned at around 10:30 am, his key failed to open the door, so he knocked for attention. Sullivan went to unlock the door; finding it jammed, she uttered an expletive. She would later testify that she heard Lizzie laughing immediately after this; she did not see Lizzie, but stated that the laughter was coming from the top of the stairs. This was considered significant as Abby was already dead by this time, and her body would have been visible to anyone on the home's second floor. Lizzie later denied being upstairs and testified that her father had asked her where Abby was, and she had replied that a messenger had delivered Abby a summons to visit a sick friend.