A £20,000 reward has been offered by Thames Valley Police for information leading to the arrest of the murderer of 66-year-old John Sheppard, a bookmaker, stabbed to death in his Cambridge Street, Aylesbury, Buckinghamshire, shop. Mr. Sheppard, who worked alone, was killed between 5.15 and 6.30 p.m. on Saturday, December 3rd, 1994. The case was re-opened in December, 2004.