A 38-year-old man from Lincoln has been charged with murder.
Margaret Lynette Krawcewicz, who was 72, was attacked in a house in Lincoln on Friday and died later in hospital.
A 38-year-old man has been charged with murder and will appear before magistrates on Monday morning.
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Security is being hiked up ahead of the arrival of dignitaries for the Conservative Party Conference this weekend.
Black denies claims he allegedly offered advice on how to bribe officials at other clubs.
The pair are accused of being involved in a series of gun attacks that took place last year.