From the above link is an excerpt about Prince Albert Victor Christian Edward, eldest child of Bertie, the Prince of Wales (future Edward VII) and his wife Alexandra of Denmark. It's about the Jack the Ripper mystery:
Prince Eddy have been linked in different ways to the murders committed in the second half of the year 1888 in Whitechapel, in the East End of London. Between August and November, 1888, five prostitutes were savagely murdered and disemboweled in Whitechapel; these women were Polly Nichols, Annie Chapman, Elizabeth Stride, Catherine Eddowes and Mary Kelly. and the killer signed as Jack the Ripper. It was said that Prnce Eddy was Jack the Ripper; a witnness who saw Mary Kelly with her killer described the man as look alike Eddy. It is quite impossible the Prince had comitted the murders since he was in Scotland in the nights when two of the victims were killed.
Another incredible but not impossible theory was presented by Stephen Knight in his book "Jack the Ripper, the final solution". Knight tells the story of a man named Joseph Sickert who claimed to be Prince Eddy's grandson. Sickert says that inspite Eddy's weak character and lack on interests, his mother, Princess Alexandra, tried to interest him in arts by putting him under the protection of a famous painter named Walter Sickert, who would be Joseph's father. In 1888, the painter introduced Eddy to Annie Elizabeth Crook, a girl who worked in a tobacco shop at Cleveland Street. Eddy and Annie felt in love and got secretly married in St. Saviour's Chapel, having only one witness besides Sickert, a certain Mary Kelly, a friend of Annie who also worked in the tobaco shop. Annie soon became pregnant and gave birth to a girl, Alice Margaret, in April 1885. The certain Mary Kelly was paid by Sickert to be Alice Margaret's nanny.
The rumor of Eddy's affair arrived to the ears of the Prince's grandmother, Queen Victoria, and her Prime Minister, Lord Salisbury. They both want the affair brought to en end and uncover Eddy's participation. By those days the Royal Family's prestige was not on its best times because of the Prince of Wales' scandalous life and the Monarchy was quite unpopular. Salisbury feared that another scandal on the Royal family would caused the end of the Monarchy in England. So a raid was organized on Cleveland Street and Pirnce Eddy was taken away from Annie's room and put under severe vigilance and Annie was taken to an insane assylum, where she died in 1920. All these was watched by Sickert from his studio on that same street. The only one who escaped was Mary Kelly who took the girl with her. Later on Alice Margaret fall on Sickert hands. Mary Kelly became a prostitute and together with a group of friends to whom she had told the secret, tried to blackmail Salisbury about Eddy's affaire. Salisbury had to silence the prostitutes in someway. The man selected for the mission was Sir William Gull, a physician who had previously performed discreet abortions in the bedchambers of Windsor, and who was also a Francmasonic. Other two men were involved: Sir Robert Anderson, Assistant Comissioner of the Metropolitan Police and also a Francmasonic, and John Netley, Eddy's coachman who had many times conducted the Prince to see Annie. If Sickert's story was true, these men comitted the murders and created the myth of Jack the Ripper.
Eddy's supposed daughter, Alice Margaret, became Walter Sickert's mistress and she beared him a son, Joseph Sickert, and died in 1950. There is no evidence to confirm this exceptional story except Joseph Sickert's testimony.
Albert Victor, Duke of Clarence and Avondale "Eddy"