The Assistant Chief Constable of Leicestershire Police Gordon Fraser, who died after being hit by a train on Friday October 19, was due to appear in court in St Albans on Monday accused of perverting the course of justice.
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Stella Manzie will take over after running the council until a permanent chief executive is found.
It comes after months of protests following United Lincolnshire Hospitals NHS Trust's (ULHT) decision to close the unit overnight.
The attacker made a swipe at her handbag, causing the victim to lose balance and fall to the floor.