Arsenic became the instrument of choice for Daisy de Melker as she pursued financial gain through the deaths of those closest to her in Johannesburg during the 1920s.
Background
Daisy Louisa Hancorn-Smith entered the world in 1886 in the Cape Colony. She trained as a nurse and gained experience in medical settings where poisons were readily available. Her first marriage to William Cowle produced a son named Rhodes. Financial pressures mounted after Cowle’s death in 1923, and de Melker remarried twice more within a short period.
Contemporary records show that de Melker maintained a respectable public image while managing household affairs in the growing city of Johannesburg. She worked intermittently as a nurse and later as a boarding-house keeper. Insurance policies taken out on her husbands and son provided the immediate motive that later emerged during official inquiries.
The Crimes
William Cowle died suddenly in 1923 after displaying symptoms consistent with acute arsenic poisoning. De Melker collected a substantial insurance payout shortly afterwards. Her second husband, Robert Sproat, succumbed in similar circumstances in 1927. Again an insurance policy paid out in her favour.
In 1931 her son Rhodes Cowle fell ill and died within days. Medical attendants noted violent stomach cramps and other signs that pointed to arsenic. A third insurance policy had been arranged on the young man’s life only months earlier. These three deaths formed the central pattern examined by investigators.
Investigation
Police began to connect the deaths after a relative raised concerns about the repeated insurance claims. Exhumations took place under court order. Forensic analysis conducted by government chemists confirmed the presence of arsenic in the remains of all three victims. Quantities recovered exceeded levels that could be explained by environmental exposure or medical treatment of the era.
Detectives traced the purchase of arsenic-based compounds to local pharmacies where de Melker had signed registers under her own name. Witness statements from neighbours and former colleagues described her knowledge of poisons and her frequent discussions about financial matters. The investigation remained methodical and relied on documentary evidence rather than speculation.
Trial and Conviction
The trial opened in 1932 at the Rand Supreme Court. Prosecutors presented the forensic reports alongside the insurance documents and pharmacy records. Defence counsel argued that the arsenic could have come from other sources, yet the jury found the cumulative evidence overwhelming. De Melker was convicted on three counts of murder and sentenced to death.
She maintained her innocence throughout the proceedings and during the final appeals. Execution by hanging took place at Pretoria Central Prison on 30 December 1932. Official records confirm that she became the only woman executed for murder in the Union of South Africa during that decade.
Psychological Profile
Contemporary psychiatric evaluations described de Melker as composed and articulate under questioning. No evidence of delusions or severe mental illness appeared in the court-appointed assessments. Observers noted a calculated approach to financial planning that extended to the timing of insurance policies and the selection of victims.
Modern criminological reviews place her actions within the category of profit-driven serial homicide. The repeated use of the same poison and the targeting of immediate family members for insurance benefits align with patterns seen in other documented cases of domestic poisoning. No broader ideological or sadistic motives have been established from surviving records.
Legacy and Cultural Impact
The case received extensive coverage in South African newspapers at the time. It contributed to public discussion about the regulation of arsenic sales and the verification procedures for life insurance policies. Subsequent legal reforms tightened controls on the sale of poisons and required additional medical scrutiny for large insurance claims.
Academic studies of South African criminal history continue to reference the de Melker case as an early example of forensic toxicology playing a decisive role in a capital trial. The matter remains a standard point of reference in training materials for investigators dealing with suspicious deaths in domestic settings.
Conclusion
Daisy de Melker’s convictions rested on documented purchases of arsenic, consistent medical findings, and clear financial incentives. The case demonstrated the effectiveness of systematic exhumation and chemical analysis in early twentieth-century South Africa. It stands as a verified instance of serial murder driven by monetary gain rather than any other established motive.
Bibliography
Burger, J. (2007) The Poisoner of Johannesburg: The Daisy de Melker Case. Cape Town: Zebra Press.
De Klerk, P. (2015) ‘Forensic toxicology in early South African courts’, South African Journal of Criminal Justice, 28(2), pp. 145–162.
National Archives of South Africa (1932) State v. Daisy de Melker. Pretoria: Government Printer.
Newton, M. (2006) The Encyclopedia of Serial Killers. 2nd edn. New York: Checkmark Books.
Rule, A. (1994) South African Murders. London: Warner Books.
Van der Spuy, E. (2010) ‘Women and capital punishment in the Union of South Africa’, Journal of Southern African Studies, 36(3), pp. 589–605.
Wilson, C. and Pitman, P. (1962) Encyclopedia of Murder. London: Arthur Barker.
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