Crowds waiting outside Holloway Jail , London to hear of the death of Mrs Styllou Christofi . She was hanged for the murder of her daughter-in-law . Mrs Hella Christofis . It was stated at her trial that she knocked her daughter-in-law unconscious , strangled her and then tried to burn the body at their home in South Hill Park , Hampstead . Mrs Christopfi is the first woman to be hanged in London since 1923 . 15 December 1954