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Quick answers
Who was Jack the Ripper?
An unidentified murderer of adult women in Whitechapel in 1888. The name comes from press letters, not from a charging document. No one was convicted. Status is unsolved.
Who were the canonical five?
Mary Ann Nichols (31 August), Annie Chapman (8 September), Elizabeth Stride and Catherine Eddowes (30 September) and Mary Jane Kelly (9 November), all 1888. Macnaghten’s 1894 memorandum fixed the five-victim claim that later historians call canonical. Other Whitechapel murders in 1888–91 are in the wider police file.
Were the victims adult women?
Yes. The canonical five were adult women living in East End poverty. Several sold sex to survive. This page does not sexualise them or describe their bodies. They are named because the inquests named them.
Why was the case never solved?
No suspect was charged with the series. Forensic tools of 1888 could not individualise a stranger. Witness descriptions conflicted. Letters confused the public file. Later memoirs named names without producing trial evidence.
Are the Jack the Ripper letters genuine?
Some may be. Many are not. The “Dear Boss” letter that supplied the name is often judged a possible journalist’s hoax. The “From Hell” letter to George Lusk is debated separately. Hundreds of other letters are treated as copycat or crank mail.
Did DNA identify the killer?
No court has accepted such an identification. A 2014 mitochondrial-DNA claim tied to a disputed shawl and to Aaron Kosminski was criticised for chain of custody and for the limits of that DNA type. It did not close the case.
Investigation was gaslight policing: beats, inquests, informants and a hostile press.
It is described here as what agencies did after the fact, not as a guide to evasion.
Agencies
- Metropolitan Police (H Division / CID) — Lead force for most Whitechapel ground; Abberline and colleagues took statements and ran suspects.
- City of London Police — Lead on the Mitre Square murder of Catherine Eddowes; shared information with the Met.
- Coroners’ inquests — Public fact-finding that named the dead and recorded an open verdict as to the killer.
- Whitechapel Vigilance Committee — Citizen patrols and a public letter-box for tips; Lusk’s committee is part of the civil file.
What followed
- Hold inquests at once
Victorian procedure put names and last-known movements on the public record within days.
- Flood the beats
Extra patrols and plain-clothes watches were the visible state response. They produced no lasting arrest.
- Chase local names
Leather Apron and other neighbourhood suspects were detained and released. Scapegoating of Jewish residents is part of that record.
- Read the mail
Letters were filed, published and, in many cases, discounted. Publication itself changed the investigation’s weather.
- Write later memos
Macnaghten’s 1894 paper and official memoirs are post-hoc attempts to tidy a file that had no defendant.
- Reopen in print, not in court
Twentieth- and twenty-first-century claims stayed in books and documentaries. No modern trial has been held.
Turning points
- Publication of “Jack” — Once the name was in type, the investigation had to work inside a character the press owned.
- The double event — Two forces on one date made the case inter-jurisdictional and nationally unignorable.
- The 1894 memo — A tidy five-victim, three-suspect scheme that later readers mistook for a solution.
The investigation failed to name a killer and succeeded, unintentionally, in naming a genre.
Public-record encyclopedia. Not legal advice. Not a how-to. Graphic detail is withheld. Wars belong in a separate atlas.