Following his dismissal, Arkwright returned to Adwick road in Mexborough, where he stabbed his grandfather, 68-year-old Stanislav Pudoikas, at his allotment. This resulted in Pudoikas suffering
paralysis. Arkwright then dragged Pudoikas into a shed and used a lump hammer to crush his skull. After killing his grandfather, Arkwright went on a
pub crawl in Mexborough and dropped hints about the murder, saying things such as, "It's been murder on the allotment today." It was believed that Arkwright's second victim was his grandfather's housekeeper, 73-year-old Elsa Kronadaite, whilst he was in the process of taking his grandfather's savings of
£3,000. The bodies of both Pudoikis and Kronadaite lay undiscovered for six days. The next to be killed was Arkwright's neighbour Raymond Ford, an unemployed former teacher who was already being bullied by him. Arkwright had also stolen items from Ford's flat and Ford reported him to the police for the thefts. Arkwright knew this and wanted revenge. At 3 am on 28 August 1988, he entered Ford's flat completely naked apart from a devil mask. Arkwright stabbed Ford between 250 and 540 times and draped his entrails around the room that he had been murdered in. He then went home to shower off the blood and at 7 am, the police came to arrest him for burgling Ford's flat, completely unaware that Ford lay dead next door. After being interviewed for three hours and then released on police bail for a court appearance the following week, Arkwright went out for another drinking session, amazed at being a murderer allowed to walk free from a police station. On 29 August, early in the morning, Arkwright entered the specially adapted bungalow belonging to his other next-door neighbour, Marcus Law. Law, who was 25 at the time, was in a wheelchair after a motorbike accident. In what Arkwright would describe as a punishment for all the cigarettes that Law had scrounged off him, he stabbed Law at least 70 times, before trying to gut him. When this failed, Arkwright inserted one of Law's crutches into a gaping wound in his stomach. He also gouged out Law's eyes and inserted cigarettes into his eye sockets, ears, and mouth. Law's mother found her son's body. Police arrested Arkwright, who confessed to four murders, which meant that searches for the bodies of his other victims had to be organised hastily. It was suggested that when shocked police had found the three remaining bodies, Arkwright felt that he was losing control, and so invented a fifth victim, leading to further searches of lakes and drainage ditches. Whilst at
HMP Hull awaiting trial, Arkwright smeared the walls of his cell with his faeces in a dirty protest at not being recognised and revered as he believed he should be. After convincing prison doctors that he was insane, he was transferred to
Rampton Hospital in
Nottinghamshire. Psychiatrists there determined that he was sane and fit to plead, with one doctor commenting that Arkwright was "the sanest person in the building". ==Trial==