The Chief Constable of Hertfordshire’s police force has backed a national campaign to block two of the people responsible for the death of an officer receiving an early release from prison. PC Andrew Harper, was killed on duty while representing the neighbouring Thames Valley Police force, and news that two people who played a role in his death may get an early release, has generated national uproar. Today, Chief Constable Andy Prophet signed an open letter to prevent the early release of Jessie Cole and Albert Bowers.