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The trial of Pietro Addis, grandson of murdered 69-year-old Sue Addis started today at Lewes Crown Court.
Mrs Addis, who ran Donatello and Pinocchio, both in central Brighton, was found dead at her home in Cedar Gardens in January 2021.
Pietro has admitted to killing his grandmother, but will be pleading guilty to manslaughter due to diminished responsibility.
The trial will ascertain whether he was suffering a mental health episode at the time of her killing.
The trial is being held at Lewes Crown Court and is expected to last two weeks.
Addis arriving at court last year.