In February 1991, and with the help of a private detective named Peter Jackson, Malone finally urged the Home Office to reopen the case, which was then referred back to West Yorkshire Police. Detective Superintendent Trevor Wilkinson was assigned to the job. He immediately found several glaring errors. Kiszko's innocence was demonstrated conclusively through medical evidence; he had male hypogonadism, which rendered him infertile, contradicting forensic evidence obtained at the time of the murder. In 1975, his testes had measured 4 to 5 mm, whereas the average adult testicular size was 15 to 20 mm. During his research, Jackson found someone who confirmed that Kiszko had been seen with his aunt tending his father's grave on the day the murder took place. They said they could not understand why they had not been called to give evidence at the trial. Someone else said that Kiszko had been in a shop around the time of the murder.