Louisa Merrifield poisoned a woman with phosphorus. She was born in Wigan, Lancashire, on 3 December 1906. She married her third husband, Alfred Merrifield in 1950. In 1951 they moved to Blackpool.
In March 1953, she was employed as a housekeeper to a 79-year-old woman named Sarah Ann Ricketts, who lived in a house she owned in Blackpool. Both Louisa Merrifield and her husband moved in with Mrs Ricketts.
Mrs Ricketts was so taken with her new companions that she made a will in their favour. They would inherit her house. That proved to be a deadly mistake.
Perhaps Merrifield was impatient to inherit the house. Or maybe she was afraid the old woman would change her will. At any rate, she turned to murder.
Sarah Ricketts had the odd habit of eating jam from a jar with a spoon and drinking rum with it. It’s believed that Merrifield added rat poison, which contains phosphorus, to it. Mrs Ricketts died on 14 April 1953, although a doctor visited her shortly before she died and found her to be healthy.
Louisa Merrifield did not call a doctor until the next day. He was suspicious and he refused to issue a death certificate. Instead, he phoned the police.
An autopsy was conducted and the body was found to contain poison. Several witnesses told the police that they had seen Sarah Ricketts the day before her death and she seemed normal. She certainly did not seem ill.
The police found that Merrifield had purchased rat poison from a chemist. (At the time, anyone who bought poison was legally obliged to sign a poisons register). The police also found a spoon with traces of poison, although Louisa had carefully disposed of all the jam jars Sarah Ricketts ate from.
Both Alfred and Louisa Merrifield went on trial on 20 July 1953. On 31 July, Louisa was found guilty and she was sentenced to death. Alfred Merrifield was acquitted, and he was released. Louisa Merrifield was not so lucky. She was hanged on 18 September 1953. She was the third-to-last woman to be hanged in Britain.