John Haigh was convicted of killing six people, although he claimed to have murdered several more. A compulsive gambler, his motive was financial and he plundered his victims’ pensions and properties. While in prison for fraud during the Second World War he refined his idea of dissolving bodies in acid. His final victim was Olive Durand Deacon, a 69-year-old widow who lived in the same residential hotel as he did in London. After inviting her to his West Sussex workshop (where she had wanted to discuss her idea for manufacturing artificial fingernails) he shot her and submerged her body in an acid-filled oil drum. Police found the drum, protective gloves and some ‘sludge’, which seemed to be all that remained of the body. But a pathologist delving deeper found Durand Deacon’s dentures, which her dentist was able to identify her by, and her foot bones, from which a cast was made that matched her shoes. Haigh was hanged for murder in 1949.