September 7, 1947 - Graham Young
What distinguished Young from other poisoners was the persistence of the compulsion across his entire life — beginning in childhood, surviving institutionalization, and resuming almost immediately upon release. His method required patience, proximity, and the trust of those around him, making ordinary domestic and workplace settings the sites of deliberate harm sustained over years.
From Wikipedia
Graham Frederick Young (7 September 1947 – 1 August 1990), also known as the Teacup Poisoner, was an English serial killer who murdered his victims with poison.
Obsessed with poisons from an early age, Young poisoned the food and drink of relatives and school friends. He was caught when his teacher became suspicious and contacted police. Young pleaded guilty to three non-fatal poisonings and, at age 14, was detained at Broadmoor Hospital. He later took responsibility for the death of his stepmother, though this has not been proven.
After being released in 1971, Young found a job in a factory in Bovingdon, Hertfordshire, where he poisoned some of his colleagues, resulting in two deaths and several critical illnesses. He was convicted on two counts of murder and two counts of attempted murder in 1972. Young served most of his life sentence at Parkhurst Prison, where he died of a heart attack in 1990.
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