The serial killer who nicknamed himself 'Angel of Mercy' slayed two of his neighbours in a brutal killing and wrote a chilling note to the police after the murders , Andrew Dawson gave himself the name after he murdered two of his neighbours John Matthews and Paul Hancock, in separate attacks in Chaddesden, Derbyshire, and left their bodies in their bathtubs. He told police he had an "urge" to kill, and the confession letter written by Dawson was signed off: "Yours, the Angel of Mercy," and the