Ripper suspect-Prince Albert Victor, grandson of Queen Victoria, has an alibi for several of the murder dates. Casebook.org shows that he was not in town on these dates:
August 31-Polly Nichols is murdered. Prince Albert was staying with Viscount Downe at Danby Lodge in Yorkshire from August 29-September 7.
September 8-Annie Chapman is murdered. Prince Albert was at the Calvary Barracks in York from September 7-10.
September 30-Elizabeth Stride and Catherine Eddowes are murdered. Prince Albert was in Abergeldie, Scotland from September 27-30. Queen Victoria happened to provide evidence when she recorded in her journal that she had lunch with him on September 30.
November 1-Prince Albert arrives in London from York.
November 9-Mary Kelly is murdered. Prince Albert was in Sandringham from November 2-12.