Thomas Neill Cream, known as the “Lambeth Poisoner,” was a Scottish-born doctor and serial killer active in the late 19th century. Trained in medicine, he exploited his position to administer lethal doses of strychnine, often under the guise of treating women or providing illegal abortions. His crimes spanned Canada, the United States, and England, but he became most infamous in London, where he preyed upon vulnerable women in the Lambeth district. Cream was eventually caught after leaving behind incriminating letters, and he was hanged in 1892.