Walter Sickert had been tangentially implicated in the Ripper crimes as early as the 1970s, with the release of the now infamous "Royal Conspiracy" theory. But it wasn't until the early 1990s, with the release of Jean Overton Fuller's Sickert and the Ripper Crimes, that the peculiar artist became a Ripper suspect in his own right. More recently, Patricia Cornwell has claimed to have found DNA evidence linking Sickert to at least one "Ripper letter".
We are still putting together a proper suspect page for Walter Sickert, but in the meantime you may be interested in reading Wolf Vanderlinden's excellent, in-depth essay on Sickert's candidature as Jack the Ripper, entitled The Art of Murder.
Those interested particularly in Patricia Cornwell's claims in Portrait of a Killer: Jack the Ripper - Case Closed may be interested in reading Patricia Cornwell and Walter Sickert - a Primer. This primer examines in-depth several concepts used by Ms. Cornwell to establish Sickert's guilt, suggesting that her case against the famed artist may not be as iron-clad as she'd like her readers to believe. (Warning, this article contains several spoilers).
You will also find other Sickert-related links at the bottom of this page.