Walter Sickert.
Sickert took a keen interest in the crimes of Jack the Ripper and believed he had lodged in a room used by the infamous serial killer. He had been told this by his landlady, who suspected a previous lodger. Sickert did a painting of the room and titled it "Jack the Ripper's Bedroom." It shows a dark, melancholy room with most details obscured. This painting now resides in the Manchester City Art Gallery in Manchester.
In 2002, crime novelist Patricia Cornwell, in Portrait of a Killer: Jack the Ripper—Case Closed, maintained that Sickert was Jack the Ripper.A psychological motivation for Sickert was said to be a congenital anomaly of his penis. Cornwell purchased 31 of Sickert's paintings, and some persons in the arts world have said that she destroyed one of them in a search for Sickert's DNA, but Cornwell denies having done this. Cornwell claimed she was able to scientifically prove that the DNA on a letter attributed to the Ripper and on a letter written by Sickert belong to only one percent of the population.
It may be worth mentioning that his father bought him, as a child, to London to have the anomaly rectified. I believe at the time he spoke only German, having been born there, and as was the practice at the time, no attempt was made to comfort or explain to the child what was about to happen. The operation was carried out, aided by nursing assistants to hold him still, without the use of anaesthetics. The poor child must have thought he was being murdered, on top of which the operation was unsuccessful. I couldn't be certain if his penis served any function save urination. I seem to think that some of it had to be amputated during the operation. It's easy to see how he may have developed a lifelong hatred of women if he recalled women holding him down whilst his genitals were mutilated.