Four people have been arrested in connection with the murder of a 48 year-old from Ilkeston.
Two men, aged 26 and 34, have been arrested on suspicion of murder while a 26 year-old man and 46 year-old man are being held on suspicion of conspiracy to commit murder.
They remain in police custody under questioning.
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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.
The assault is alleged to have taken place more than two years ago in Birmingham.