Murderer possibly a sailor rather than a surgeon, says new bookFor all the blood spilt by Jack the Ripper, and all the ink expended since by authors claiming to know his identity, ripperologists generally agree that with the killing of the prostitute Mary Kelly in Whitechapel on November 8 1888, his frenzied murder spree came to an abrupt end. After that "Jack" - if that was indeed his name - disappeared into the London fog, never to be seen again. But what if the murders continued in Managua, the capital of Nicaragua? And what if, after a break of eight...