Mr. Cahill was a funeral director who Toby Mills hired to assist with the burial of his mother Linda in June 2003. Linda was pushed down a flight of stairs by Toby during an argument, but the police were convinced that her death was accidental. Mr. Cahill informed Toby that as the post-mortem had been completed, Linda could be moved to the funeral home and funeral arrangements could begin. Mr. Cahill asked about Toby's father, but his fiancée Ellie Hunter advised him against asking. As Mr. Cahill showed Toby a range of coffins, Toby struggled and asked Ellie to make the decision for him.