The Times, Thursday, Jan 10, 1963; pg. 5; Issue 55595; col C
Mrs Mary Elizabeth Wilson, of the village of Windynook, co. Durham, the widow who was sentenced to death in 1958 for poisoning two husbands and then reprieved, has died in Holloway prison, London, it was learnt yesterday. She was 71.
ETA: Presuming that it took some time for the papers to get wind of her death, the one that Anna found looks close.