Ruth Ellis became a nightclub hostess through nude modelling work, which paid significantly more than the various factory and clerical jobs she had held since leaving school. Morris Conley, the manager of the Court Club in Duke Street, where she worked, blackmailed his hostess employees into sleeping with him. Early in 1950 she became pregnant by one of her regular customers, having taken up prostitution. She had this pregnancy terminated (illegally) in the third month and returned to work as soon as she could. On 8 November 1950, she married 41-year-old George Ellis, a divorced dentist with two sons, at the register office in Tonbridge, Kent. He had been a customer at the Court Club. He was a violent alcoholic, jealous and possessive, and the marriage deteriorated rapidly because he was convinced she was having an affair. Ruth left him several times but always returned. In 1951, while four months pregnant, Ruth appeared, uncredited, as a beauty queen in the Rank film Lady Godiva Rides Again. She subsequently gave birth to a daughter Georgina, but George refused to acknowledge paternity and they separated shortly afterwards. Ruth and her daughter moved in with her parents and she went back to hostessing to make ends meet.

In 1953, Ruth Ellis became the manager of The Little Club, a nightclub. At this time, she was lavished with expensive gifts by admirers, and had a number of celebrity friends. She met David Blakely, three years her junior, through racing driver Mike Hawthorn. Blakely was a well-mannered former public school boy, but also a hard-drinking racer. Within weeks he moved into her flat above the club, despite being engaged to another woman, Mary Dawson. Ellis became pregnant for the fourth time but aborted the child, feeling she could not reciprocate the level of commitment shown by Blakely towards their relationship. She then began seeing Desmond Cussen. Born in 1921 in Surrey, he had been an RAF pilot, flying Lancaster bombers during the Second World War, leaving the RAF in 1946, when he took up accountancy. He was appointed a director of the family business Cussen & Co., a wholesale and retail tobacconists with outlets in London and South Wales. When Ruth was sacked as manager of the Carroll Club, she moved in with Cussen at 20 Goodward Court, Devonshire Street, north of Oxford Street, becoming his mistress. The relationship with Blakely continued, however, and became increasingly violent and embittered as Ellis and Blakely continued to see other people. Blakely offered to marry Ellis, to which she consented, but she lost another child in January 1955, after a miscarriage induced by a punch to the stomach in an argument with Blakely.

On Easter Sunday, 10 April 1955, Ruth Ellis took a taxi from Cussen’s home to a second floor flat at 29 Tanza Road, Hampstead, the home of Anthony and Carole Findlater and where she suspected Blakely might be. As she arrived, Blakely’s car drove off, so she paid off the taxi and walked the quarter mile to the Magdala,[8] a four-storey public house in South Hill Park, Hampstead, where she found Blakely’s car parked outside. At around 9:30 pm David Blakely and his friend Clive Gunnell emerged. Blakely passed Ellis waiting on the pavement when she stepped out of Henshaws Doorway, a newsagent next to the Magdala. He ignored her when she said “Hello, David,” then shouted “David!” As Blakely searched for the keys to his car, Ellis took a .38 calibre Smith & Wesson Victory model revolver from her handbag and fired five shots at Blakely. The first shot missed and he started to run, pursued by Ellis round the car, where she fired a second, which caused him to collapse onto the pavement. She then stood over him and fired three more bullets into him. One bullet was fired less than half an inch from Blakely’s back and left powder burns on his skin.

Ruth Ellis was seen to stand mesmerised over the body and witnesses reported hearing several distinct clicks as she tried to fire the revolver’s sixth and final shot, before finally firing into the ground. This bullet ricocheted off the road and injured Gladys Kensington Yule, 53, the wife of a local banker, in the base of her thumb, as she walked to the Magdala. Ellis, in a state of shock, asked Gunnell, “Will you call the police, Clive?” She was arrested immediately by an off-duty policeman, Alan Thompson, who took the still-smoking gun from her, put it in his coat pocket, and heard her say, “I am guilty, I’m a little confused.” She was taken to Hampstead police station where she appeared to be calm and not obviously under the influence of drink or drugs. She made a detailed confession to the police and was charged with murder. Blakely’s body was taken to hospital with multiple bullet wounds to the intestines, liver, lung, aorta and windpipe.

Ever since Edith Thompson’s execution in 1923, condemned female prisoners had been required to wear thick padded calico knickers, so just prior to the allotted time, Warder Evelyn Galilee, who had guarded Ellis for the previous three weeks, took her to the lavatory. Warder Galilee said, “I’m sorry, Ruth, but I’ve got to do this.” They had tapes back and front to pull. Ellis said “Is that all right?” and “Would you pull these tapes, Evelyn? I’ll pull the others.” On re-entering the condemned cell, she took off her glasses, placed them on the table and said “I won’t be needing these anymore.” Thirty seconds before 9 am on Wednesday 13 July, the official hangman, Albert Pierrepoint, and his assistant, Royston Rickard, entered the condemned cell and escorted Ruth 15 feet (4.6 m) to the execution room next door. She had been weighed at 103 pounds (47 kg) the previous day and a drop of 8 ft 4in (2.54 meters) was set. Pierrepoint carried out the execution in just 12 seconds and her body was left hanging for an hour. Her autopsy report, by the pathologist Dr Keith Simpson, was made public. The Bishop of Stepney, Joost de Blank, visited Ellis just before her death, and she told him, “It is quite clear to me that I was not the person who shot him. When I saw myself with the revolver I knew I was another person.” These comments were made in a London evening paper of the time, The Star.