 While he hid Morley's body in a side office, Gerda changed Mabelle's records to become those of Mrs. Chapman - both this and Mabelle's face being disfigured after her murder, were to mislead the police on who the body in Chapman's apartment was.After his wife left, Blunt posed as Morley, knowing Amberiotis had never seen the dentist before.After summoning him into the surgery, Blunt injected him with a fatal dose of anesthetic.