Biography
William Withey Gull was born on the 8th December 1816 in St. Leonard Colchester. He was the youngest of eight children and his father John Gull, a barge owner died of cholera in London in 1827. In 1837 William was accepted as a student at Guy's Hospital, this began an association with the establishment which lasted his whole life. In 1841 he graduated from the University of London with an MB in Physiology, Comparative Anatomy, Medicine and Surgery then in 1843 he became a lecturer in Natural Philosophy and he received his MD in 1846. In 1846-1847 he had the post of Lecturer on Physiology and Comparative Anatomy at Guy's. In 1847-1849 he was a medical tutor and lecturer at Guy's Hospital and Fullerian Professor of Physiology. He married Susan Anne Dacre Lacy in 1848 and they had two children Cameron and Caroline. Gull was made a Fellow of the Royal Society and he achieved national prominence in 1871 for treating the prince for typhus. He was rewarded with a Baronet in 1872 and also became Physician-In-Ordinary to Queen Victoria.Gull died on January 29th 1890.
Relationship To The Murders
He didn't know any of the prostitutes and no apparent dislike towards women, after all he was married. He doesn't have any solid alibis though.
Evidence
Sir William Gull has medical knowledge as you can see at the top of this page in his biography. He would have access to all the tools needed because he was a professional. Even though he was old and he had just had a stroke he could have had a coach to take him around. There was a witness at the time of one of the murders who said the perpetrator seemed weak.
Motive
Prince Albert Victor married a prostitute secretly and there were five witnesses to the wedding who were all prostitutes. This would have disgraced the Royal family so the Queen could have asked Sir William Gull to do it, who would have agreed. This is just a theory but it hasn't been proven wrong.He also was one of the Upper Class Londoners and could have thought he was "cleaning the streets" ie: killing prostitutes.
Timeline
Martha Tabram:
Date of Murder: August 7th 1888
Location of Murder: George Yard Buildings
Mary Ann Nicholas (Polly):
Date of Murder: August 31st 1888
Location of Murder: Bucks Row
Annie Chapman (Dark Annie):
Date of Murder: September 8th 1888
Location of Murder: Number 29 Hanbury Street
Elizabeth Stride (Long Liz):
Date of Murder: September 30th 1888
Location of Murder: Dutfield's Yard Berner Street
Catherine Eddows:
Date of Murder: September 30th 1888
Location of Murder: Mitre Square
Mary Jane Kelly (Black Mary):
Date of Murder: November 9th 1888
Location of Murder: Number 13 Miller's Court, Dorset Street
Sources
http://content.karger.com/produktedb/produkte.asp?typ=fulltext&file=ENE2006055001053
http://en.wikipedia.org/wiki/William_Gull
http://en.wikipedia.org/wiki/Jack_the_Ripper_royal_conspiracy_theories