Via the Telegraph:
It was found among possessions belonging to Welsh surgeon Sir John Williams, a chief suspect in the Victorian murders. Sir John, known to his family at the time of the killings as “Uncle Jack” was the surgeon to Queen Victoria who lived in London at the time of the slayings.
He fled the capital after the murders and later founded the National Library for Wales in Aberystwyth. One of his distant relatives has now unearthed the old black-handled surgeon’s knife, which he used for operations, and believes it could be the murder weapon.
Tony Williams, 49, Sir John’s great-great-great-great nephew, has now published a book, which features the startling image of the knife, to expose his relative’s guilt.