Ok, hopefully I won't be poisoned for saying this (looks around sheepishly for "Grey Men") - LOL! This is the Freemason theory:
According to a tale told by Joseph Gorman, an obscure London artist who took the name Joseph Sickert, and claimed to be the illegitimate son of Walter Sickert, suggests Eddy, on one of his visits to a homosexual brothel in Cleveland Street, met and fell in love with a young woman named Elizabeth Crook, who worked in a florists shop at 6 Cleveland Street.
A secret marriage took place, despite the fact that she was a Roman Catholic. The marriage bore a daughter Alice Margaret, one of the witnesses to the marriage was Mary Kelly. Eddy had his wife and daughter settled in an apartment in Cleveland Street, though when news of an illegitimate great-grandchild came to Queen Victoria's attention, she informed the Prime Minister Lord Salisbury, who afraid that knowledge of the existence of Alice as a Catholic heir to the throne would result in a revolution, ordered a raid on the apartment. Annie was placed in Guy's hospital under the custody of Sir William Gull, who supposedly conducted experiments on her, which drove her insane. She died on 23 February 1920 at the age of 55 after spending more then thirty years in various hospitals and workhouses. Alice survived, and was cared for by Mary Kelly, and was later said to have become Walter Sickert's mistress, they allegedly had a son Joseph. Mary Kelly then began to blackmail the government and was murdered, along with all the friends that she had confided her secret to, by a group of high ranking Freemasons, led by the Prime Minister, Robert Cecil, Sir William Gull, Lord Randolph Churchill, Sir Robert Anderson, and/or Montague John Druitt and James Kenneth Stephens.
Eddie went crazy after Annie's death. They had to get rid of him and so he was sent to Glamis Castle in Scotland where he lived until he died in 1933. Claude, Earl of Strathmore and Kinghorne, the owner of Glamis Castle was promised that one of his daughters could marry one of the Royal Princes, in exchange for him keeping Eddie. 26 April 1923 Claude's daughter Lady Elizabeth Bowes-Lyon was married to George, Duke of York who later became George VI. This would explain Elizabeth's reticence to enter a Royal marriage, because she knew what they had done to Eddie and was afraid the same thing would happen to her husband and her.
There is new proof from recently released documents that the Ripper victims may have known one another. Though some have said Robert Cecil was not a Freemason, there is clearly a picture of him with the King and Prince Eddy wearing their Freemason garb. The doctors at Eddie's official "death" - Manby, Laking and Broadbent - were also all Freemasons.