The Court of Appeal in Belfast has ordered that Brian Shivers face a retrial for the murders of two British soldiers at Massereene barracks in 2009.
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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.