It is the question every visitor to Whitechapel asks, standing in the same fog-dampened streets where it all happened: who was Jack the Ripper? More than 135 years after the autumn of 1888, the answer still refuses to arrive. Scotland Yard opened one of the largest investigations in Victorian history, questioned more than two thousand people, and examined hundreds of suspects. And yet the most famous murderer in British history was never caught, never named, never tried.
That hasn’t stopped people from trying. Over the decades, a cast of suspects has been proposed, argued over, written about, and occasionally ruined. Some are famous. Some are forgotten. A few were only added to the list in the last twenty years. In this guide, we walk through the five suspects who have generated the most enduring theories, the evidence for each, and the reasons why the case remains open.
Montague John Druitt: The Barrister Who Vanished
Montague Druitt was a 31-year-old barrister and schoolteacher from a respectable Dorset family. He was also, by late 1888, a man in serious trouble. He had recently been dismissed from his teaching post at a boarding school in Blackheath, and his family had a documented history of mental illness. His mother had been committed to an asylum.
On 1 December 1888, barely a month after the final canonical murder, Druitt disappeared. His body was found floating in the Thames at Chiswick at the end of that month, with heavy stones in his pockets. The timing was the key. If Druitt was the Ripper, the murders stopped when he died. Inspector Frederick Abberline, the officer who led the Whitechapel investigation, reportedly believed Druitt was “the most likely” suspect, though the claim only surfaced years later from a journalist.
The case for Druitt rests almost entirely on that timing and his family’s instability. There is no direct evidence placing him in Whitechapel on any of the murder dates. Modern Ripper historians are deeply divided: some consider him a strong suspect, others dismiss him as a coincidence of timing.
Aaron Kosminski: The Polish Barber
Aaron Kosminski was a 23-year-old Polish-Jewish hairdresser living in Whitechapel. He was admitted to Colney Hatch Lunatic Asylum in 1891, diagnosed with schizophrenia, and spent the rest of his life in institutional care. In 2014, a DNA study claimed to have matched mitochondrial DNA from a shawl allegedly found beside Catherine Eddowes’s body to Kosminski’s relatives. The claim made headlines around the world.
But the shawl’s provenance is fiercely disputed. Critics point out that the shawl only emerged in the possession of a police officer’s descendants decades after the murders, that its chain of custody is unverifiable, and that the DNA evidence has been questioned by geneticists. Even the author of the study acknowledged the findings could not prove guilt. Kosminski remains a fascinating suspect, and the 2014 study gave his name a new life, but the evidence is far from conclusive.
Michael Ostrog: The Career Criminal
Michael Ostrog was a Russian-born thief and fraudster with a long criminal record who drifted through London’s hospitals and workhouses. He was named in a police memorandum from 1894, alongside Druitt and Kosminski, as a possible suspect. But that memorandum, written by Assistant Commissioner Sir Robert Anderson, appears to hedge: Anderson wrote that the three names were “the only ones that had been brought to our notice”.
Most historians now dismiss Ostrog. There is no evidence he was in Whitechapel during the murders, no physical description matching the witnesses’ accounts, and his known crimes were non-violent theft and fraud. His inclusion in the memorandum seems to have been a case of the police listing every name they had, rather than naming a prime suspect. The theory that Ostrog was the Ripper has faded for good reason.
John Pizer: The Leather Apron
Before the name “Jack the Ripper” existed, the press had a different monster. In early September 1888, newspapers were full of warnings about a figure they called “Leather Apron”, a man supposedly seen threatening women in Whitechapel. The description matched John Pizer, a Jewish boot-finisher who wore a leather apron for his work.
Pizer was arrested on 10 September 1888 and quickly released when police confirmed he had airtight alibis for both of the murders committed so far. He was never a serious suspect in the investigation itself. But his story matters for a different reason: it shows how quickly fear and prejudice could turn a name into a headline. The “Leather Apron” panic foreshadowed the way the Ripper case would consume the press, and it is a reminder that some of the most famous “suspects” were victims of the era’s anti-immigrant hysteria rather than genuine leads.
James Maybrick: The Cotton Merchant’s Diary
No suspect has generated more controversy than James Maybrick, a Liverpool cotton merchant. In 1992, a diary surfaced claiming to be Maybrick’s confession, written in his own hand and dated 1889. The diary named him as Jack the Ripper and included details that seemed to match the murders. It was published to enormous publicity and became a bestseller.
Almost immediately, experts began picking it apart. Handwriting analysts questioned whether the diary matched Maybrick’s known handwriting. Historians pointed out that it contained factual errors about the murders, and that the details it “predicted” had actually been published in newspapers before the diary was written. The diary’s provenance remains unexplained, and most academics regard it as a hoax, possibly created in the 1980s. The Maybrick theory lives on in books and documentaries, but the evidence against him is, in the words of one Ripper historian, “a diary that no one can prove is real”.
The Suspects the Police Actually Considered
It is worth remembering that the five names above are the ones that have captured the public imagination. The actual police investigation was messier. Officers questioned thousands of people, detained hundreds, and formally considered a far wider range of suspects, including butchers, slaughtermen, sailors, and even members of the medical profession, who some theorised could have possessed the anatomical knowledge displayed in the murders. One of the most persistent theories involves a member of the royal family, though it has never been supported by any credible evidence.
What all the suspects share is a frustrating absence of certainty. The Ripper case is unique in criminal history precisely because it offers so many plausible candidates and so little proof. A century and a half of investigation has produced theories, books, documentaries, and even a diary, but no conviction. The case remains, officially, unsolved.
Why the Case Still Fascinates Us
Part of the answer lies in the victims. The five women murdered in Whitechapel in 1888 were among the poorest and most vulnerable people in London. They lived in the lodging houses, walked the same streets, and died in the same alleys. Their story, told properly, is not just a mystery to be solved. It is a window into the desperate world of Victorian Whitechapel and the lives of the five victims who lived there.
Part of the answer is the atmosphere. The fog, the gaslight, the narrow courts, the sense that a killer could move unseen through one of the most crowded districts on earth. Even the name itself came from a letter that may have been a hoax.
And part of the answer is that the mystery is genuinely unsolvable with the evidence we have. Every new suspect, every DNA claim, every rediscovered diary is examined, debated, and eventually shelved. The Whitechapel murders remain the greatest unsolved case in British history, and the suspects above are the reason why.
Walk the Streets and Decide for Yourself
The best way to engage with the Ripper mystery is not to read about it, but to stand where it happened. Our Jack the Ripper walking tour takes you through the actual streets of Whitechapel, past the sites associated with the murders, and into the world the victims and suspects inhabited. You will hear the evidence, weigh the theories, and, like every investigator before you, decide for yourself who you believe.
Curious about the details of the case? Read about the pubs where the Ripper may have drunk, or ask yourself whether a Ripper tour is worth it.
Frequently Asked Questions
Who was the most likely Jack the Ripper suspect?
There is no consensus. Montague Druitt and Aaron Kosminski are the two names most frequently discussed by modern historians, but neither has conclusive evidence against them. The official investigation named no one, and the case remains formally unsolved.
How many Jack the Ripper suspects are there?
More than 100 named individuals have been proposed as Jack the Ripper over the years, ranging from butchers and sailors to barristers and members of the royal family. The five in this guide are the ones with the most enduring and widely debated theories.
Was Jack the Ripper ever caught?
No. Despite one of the largest police investigations of the Victorian era, Jack the Ripper was never identified, caught, or tried. The case remains the most famous unsolved murder investigation in British history.
