Amazon Publishing has released an essay by bestselling author Patricia Cornwell, which documents her investigation of Jack the Ripper for her 2002 title, Portrait of a Killer. "Chasing the Ripper," published today as a Kindle Single by Amazon imprint Thomas & Mercer, is priced at $1.99.

In the essay, Cornwell reiterates and defends her identification of the serial killer as British painter Walter Sickert. “I am the first to investigate Walter Sickert in the same way we would investigate a suspect today,” said Cornwell. “I provide the evidence in 'Chasing the Ripper' and I’ll let you deliberate and decide if he is indeed the most notorious serial killer of all time.”