‘For the sake of decency, gentlemen, don't hang me high.’ This was the last request of modest murderess Mary Blandy, who was hanged for poisoning her father in 1752. Concerned that the young men in the crowd who had thronged to see her execution might look up her skirts as she was ‘turned off’ by the hangman, this last nod to propriety might appear farcical in one who was about to meet her maker. Yet this was just another aspect of a case which attracted so much public attention in its day that some determined spectators even went to the lengths of climbing through the courtroom windows to get a glimpse of Mary while on trial. Indeed her case remained newsworthy for the best part of 1752, for months garnering endless scrutiny and mixed reaction in the popular press.Opinions are certainly still divided on the matter of Mary’s ‘intention’ in the poisoning of her father, and the extent to which her coercive lover, Captain William Cranstoun, was responsible for this murder by proxy. Yet Mary Blandy’s trial was also notable in that it was the first time that detailed medical evidence had been presented in a court of law on a charge of murder by poisoning, and the first time that any court had accepted toxicological evidence in an arsenic poisoning case. The forensic legacy of the acceptance of Dr Anthony Addington’s application of chemistry to a criminal investigation is another compelling aspect of The First Forensic Hanging.