Eventually Rachel managed to solve the mystery of the killer, realising it was Geoff Hastings, the brother of Veronica Hastings, the friend in question. Rachel revealed the killer to Gill and Andy before phoning Janet. Unfortunately for Janet, Geoff was there and heard the call. For a while, Geoff had been 'helping' Janet with her investigation. Geoff overpowered Janet and stabbed her in the stomach.
Janet was rushed to A&E and she managed to survive, and a year later she was finally able to question Geoff. For a year Geoff had been in prison, and he was taken to the syndicate 9 station, where he revealed he had murdered 17 other women and he had written diaries in code documenting the killings, but he refused to tell the police where they were (Rachel would later figure out they were hidden inside his mother's grave when she was drunk), and he lost his temper when the police realised where they were.