The distraught mother of a schoolgirl stabbed to death by her father has spoken for the first time to plead for his release from prison . Simon Vickers, 50, is a month into a life sentence for the murder of 14-year-old Scarlett Vickers, who was killed by a knife wound to the heart in the family's kitchen. But Vickers' partner of 27 years, Sarah Hall, refuses to condemn him and has launched a campaign to have his murder sentence overturned. She said: "All we want is to be able to grieve for our