"Uncle Jack"

Sir John Williams, a friend of Queen Victoria and obstetrician to her daughter Princess Beatrice, was accused of the Ripper crimes in a 2005 book, Uncle Jack, written by one of the surgeon's descendants, Tony Williams, and co-authored by Humphrey Price.
The authors claim that the victims knew the doctor personally and that they were killed and mutilated in an attempt to research the causes of infertility. The book also claims that a badly blunted surgical knife, which belonged to Sir John Williams, was the murder weapon.
It is clear that Sir John was suspected due to the fact that he like many other suspects was a Doctor, and therefore had access to many of the instruments used by the Ripper. The fact he was a Doctor also led people to believe that he would have been more interested in the dissecting of the bodies, with the state in which they were left.