Who was Jack the Ripper?
More than a century of suspects, confessions, and headlines. The murders are real and documented; nearly every named killer is not. Here is what the evidence actually supports.
2 established, 2 disputed, 1 debunked, 0 unresolved. We do not pick an answer; the evidence places each claim. How we decide
10 citations from 3 independent sources - 7 echo the same voices and count once. Graded C1-D1.
Added 3 Jul 2026 - updated 9 Jul 2026
What the four states mean
- Establishedsupported, uncontested
- Disputedcredible sources disagree
- Debunkedrefuted by the evidence
- Unresolvedno settled answer
Established 2supported, uncontested
Five "canonical" victims were murdered in the Whitechapel district of London in the autumn of 1888.▰▰▱▱▱ likelysummary-sourced1 source
Supports- Five "canonical" victims were murdered in the Whitechapel district of London in the autumn of 1888.Wikipedia: Jack the Ripper summary
The murders were never officially solved and no one was charged.▰▰▱▱▱ likelysummary-sourced1 source
Supports- The murders were never officially solved and no one was charged.Wikipedia: Jack the Ripper summary
Disputed 2credible sources disagree
Aaron Kosminski, a Polish barber, was the killer.▰▰▰▱▱ roughly even chance1 againstsummary-sourced2 points
Supports- Senior officers Robert Anderson and chief inspector Donald Swanson named a Polish Jew as the suspect (the Swanson marginalia).Wikipedia: Aaron Kosminski summary
Against- He was never charged; the identification rests on police memoirs written years later, and Kosminski was institutionalised for harmlessness.Wikipedia: Aaron Kosminski summary
Montague John Druitt was the killer.▰▰▰▱▱ roughly even chance1 againstsummary-sourced2 points
Supports- Melville Macnaghten named Druitt as a suspect; he died by suicide weeks after the final canonical murder.Wikipedia: Montague Druitt summary
Against- No direct evidence links Druitt to the crimes, and Macnaghten's memo contains factual errors about him.Wikipedia: Montague Druitt summary
Debunked 1refuted by the evidence
A 2014 DNA analysis of a shawl conclusively identified Kosminski as the Ripper.Refuted by
The analysis was never published in a peer-reviewed journal; the shawl's provenance and contamination over 126 years are unestablished.
refuted2 against4 pointsThe claim rested on- The Independent: 'Jack the Ripper finally identified as Aaron Kosminski, claims author'The Independent (2014 coverage) summary
- The Times: same shawl-DNA announcement, reporting the author's claim.The Times (2014 coverage) summary
Refuted by- The analysis was never published in a peer-reviewed journal; the shawl's provenance and contamination over 126 years are unestablished.Wikipedia: Aaron Kosminski summary
- Geneticists noted a nomenclature error (the '314.1C' mistake) that, if real, makes the mitochondrial-DNA match statistically worthless.Science / Casebook critique of the 2014 mtDNA claim analysis
Spotted an error, or have a source to add? (tell us which claim). Missing a topic? .