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The infamous serial killer, who stalked London in the late 1880s, has been pinpointed as British impressionist painter Walter Sickert.

Patricia, 57, who has sold more than 100million books, is set to publish 11 years of new research which she says will support her claims.

The American writer also believes she has unearthed links between the German artist and the Royal Family leading to suggestions of a “conspiracy” over the murders.

She worked with former Scotland Yard commander John Grieve on the project and was given access to letters supposedly sent by the Ripper to police.

A crucial piece of evidence is that watermarks on some letters match those of paper used by Sickert, according to the award-winning author.

Patricia said: “I believe that I have cracked it. I believe it’s Sickert, and I believe it now more than ever.”

She admitted it would be impossible to prove but said it was “really hard to feel” the watermarks were “coincidental”.

“I do think this series of crimes will forever intrigue people and be cloaked in mystery,” she added.

The millionaire novelist used her own money to probe the identity of the Ripper, who murdered at least five prostitutes in Whitechapel, east London.

She bought Sickert’s desk and more than 30 of his paintings to have them tested for DNA.

Patricia added: “I have a lot more detail including information on what I call the ‘royal conspiracy’.

She says Queen Victoria’s surgeon Sir William Gull was also Sickert’s family physician and had been rumoured to have helped “get rid” of prostitutes.