In 1926, Matters proposed in a magazine article that the notorious serial killer Jack the Ripper was an eminent doctor, whose son had died from syphilis caught from a prostitute. According to Matters, the doctor, given the pseudonym "Dr Stanley", committed the murders in revenge and then fled to Argentina. Matters claimed he had discovered an account of Stanley's deathbed confession in a South American newspaper. He expanded his ideas into a book, The Mystery of Jack the Ripper, in 1929. The book was marketed as a serious study, but it contains obvious factual errors and the documents it supposedly uses as references have never been found. True crime writer Edmund Pearson, who was Matters' contemporary, said scathingly, "The deathbed confession bears about the same relation to the facts of criminology as the exploits of Peter Rabbit and Jerry Muskrat do to zoology." Ripper expert and former policeman Donald Rumbelow thought the theory was "almost certainly invented", and Stephen Knight, who wrote Jack the Ripper: The Final Solution, thought it was "based on unsupported and palpably false statements". Nevertheless, The Mystery of Jack the Ripper was the first full-length book on the Ripper, and it inspired further fictional works such as the theatre play Murder Most Foul and the film Jack the Ripper.
In the 1929 general election, Matters was elected to the United Kingdom House of Commons as the Member of Parliament (MP) for Kennington in London. He held the seat for two years, until his defeat at the 1931 general election, and was unsuccessful when he stood again in 1935.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "K" (part 1)
- Woods, Paul; Baddeley, Gavin (2009). Saucy Jack: The Elusive Ripper, Hersham, Surrey: Ian Allan Publishing, ISBN 978-0-7110-3410-5, pp. 114–115
- Pearson, Edmund Lester (1936) More Studies in Murder, New York: Random House
- Rumbelow, Donald (1975) The Complete Jack the Ripper, London: W. H. Allen
- Knight, Stephen (1976), Jack the Ripper: The Final Solution. London: Harrap
- Wilson, Colin; Odell, Robin (1987) Jack the Ripper: Summing Up and Verdict, Bantam Press, ISBN 0-593-01020-5, p. 95
- Woods and Baddeley, pp. 160, 198
- Craig, F. W. S. (1983) . British parliamentary election results 1918–1949 (3rd ed.). Chichester: Parliamentary Research Services. p. 34. ISBN 0-900178-06-X.
- "No. 33508". The London Gazette. 21 June 1929. p. 4110.
|Parliament of the United Kingdom|
| Member of Parliament for Kennington