BBC News Published image captionRoss MacDougall and Dawn Smith were jailed for murder Two people convicted of stabbing a woman to death in Shetland claim they have fallen victim to miscarriages of justice. Ross MacDougall, 33, and Dawn Smith, 29, had denied murdering Tracy Walker, 40, in Lerwick in July 2019. MacDougall was jailed for a minimum of 23 years and Smith was ordered to serve at least 20 years and two months. Lawyers told the Court of Criminal Appeal the trial judge made mistakes when giving legal directions to jurors. Lady Dorrian, Lord Pentland and Lord Turnbull were told that the duo should have their convictions quashed.