Born : 1835
1855 : Joined Metropolitan Police then resigns so as to fight in the Crimean War.
1856 : Rejoined the police, warrant number 35059. He served most of his career in the East End.
1887 : Involved in the Lipski Case
1888 : Head of H Division (Whitechapel) at the time of the murders.
1903 : Jan 19 - Retired.
In an interview with the Eastern Post in February 1893 Arnold said that "...not more than four of these murders were committed by the same hand. They were the murders of Annie Champan in Hanbury Street, Mrs Nicholls in Buck's Row, Elizabeth Stride in Berner Street and Mary Kelly in Mitre Square." It is not clear if he is dismissing Catherine Eddowes or Mary Kelly as a Ripper victim.
Begg, Fido, and Skinner. The Jack the Ripper A-Z.