Ancona's breasts and neck. After Ancona had told a friend that Krone, a regular customer, was going to help her close the bar the previous night, the police brought him in to make a Styrofoam impression of his teeth. After comparing the teeth marks, Krone was arrested for the murder, kidnapping, and sexual assault of Ancona on December 31, 1991. At the trial in 1992, Krone pled innocence, but the teeth mark comparison led the jury to find him guilty and he was sentenced to death as well as a consecutive twenty-one year term of imprisonment. Krone's family also believed that he was innocent, which led them to spend over $300,000 in order to fight for his freedom. The Death Penalty Information Center has identified at least 190 former death-row prisoners in the United States who have been exonerated since 1973. DPIC reported in February 2021 that exonerated death-row prisoners had been wrongly convicted and sentenced to death in 29 different states and in 118 different counties. The leading causes of these wrongful capital convictions were official misconduct by police, prosecutors, or other government officials and perjury or false accusation. Underscoring the often intentional nature of wrongful capital convictions, more than half of all exonerations involved both official misconduct and perjury or false accusation, and at least one or the other was present in nearly 83% of the cases. In the UK, reviews prompted by the Criminal Cases Review Commission have resulted in one pardon and three exonerations for people that were executed between 1950 and 1953 (when the execution rate in England and Wales averaged 17 per year), with compensation being paid. Timothy Evans was granted a posthumous free pardon in 1966. Mahmood Hussein Mattan was convicted in 1952 and was the last person to be hanged in Cardiff, Wales, but had his conviction quashed in 1998. George Kelly was hanged at Liverpool in 1950, but had his conviction quashed by the Court of Appeal in June 2003. Derek Bentley had his conviction quashed in 1998 with the appeal trial judge, Lord Bingham, noting that the original trial judge, Lord Goddard, had denied the defendant "the fair trial which is the birthright of every British citizen." Colin Campbell Ross (1892–1922) was an Australian wine-bar owner executed for the murder of a child which became known as The Gun Alley Murder, despite there being evidence that he was innocent. Following