In Portrait of a Killer: Jack the Ripper, Case Closed, Cornwell combines the rigorous discipline of twenty-first century police investigation with forensic techniques undreamed of during the late Victorian era to solve one of the most infamous and difficult serial murder cases in history. Drawing on unparalleled access to original Ripper evidence, documents, and records, as well as archival, academic, and law-enforcement resources, FBI profilers, and top forensic scientists, Cornwell reveals that Jack the Ripper was none other than a respected painter of his day, an artist now collected by some of the world’s finest museums: Walter Richard Sickert.