The Whitechapel Murders - Analyses the post mortem data from the murders, and speculates on whether or not Mary Kelly can be considered a victim. Casebook: Jack the Ripper - Comprehensive and research site devoted to the Whitechapel Murders of London, 1888. The National Archives: Jack the Ripper Letters - Images and descriptions of letters reportedly sent by him. Wikipedia - Jack the Ripper - Information on the murders, the subsequent investigation, and theories about the killers identity. Jack the Ripper Murder Sites - A virtual tour with present day photographs of the five murder sites. Metropolitan Police: Jack the Ripper - From the Crime Museum. Includes pictures and a timeline.