Project Blue Book, Part 5: The Facts, the Skeptics, and the Debunking

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Jack the Ripper, Part 3: Every Suspect, Examined

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Victorian detective's desk with case files, evoking the Jack the Ripper suspect investigation.

More than 130 years after the Whitechapel murders, well over a hundred men have been named as possible suspects in the case, everyone from local laborers to physicians to, in one enduring theory, a member of the British royal family. As covered in Part 1 of this series, five women were killed and no one was ever charged. As covered in Part 2, the letters connected to the case only deepened the uncertainty rather than resolving it. This part narrows the enormous suspect list down to the candidates taken most seriously, both by the Victorian police who investigated the case in real time and by the researchers who've picked it apart in the century since.

Who Were the Police's Own Top Suspects?

The single most influential document in the entire case is a private memorandum written in 1894 by Sir Melville Macnaghten, an assistant chief constable at Scotland Yard. Macnaghten wrote it specifically to push back against a newspaper report naming an unrelated man as the Ripper, and in doing so, he listed three men he personally considered far more likely suspects: Montague John Druitt, Aaron Kosminski, and Michael Ostrog. Because Macnaghten had direct access to the original investigation files, his memorandum has shaped serious Ripper research ever since, even though he himself joined the police force after the murders had already ended and was working partly from secondhand information.

Was Montague Druitt Jack the Ripper?

Druitt was an English barrister and assistant schoolmaster, educated at Winchester College and Oxford, whose father had been a surgeon, a detail that mattered because a member of parliament had publicly speculated around the same time that the killer was "the son of a surgeon." Macnaghten favored Druitt partly because of that circumstantial detail and partly because of timing: Druitt's body was pulled from the Thames in December 1888, roughly a month after the final canonical murder, having drowned under circumstances suggesting suicide. Macnaghten's underlying theory was that the killings stopped because the killer had died, and Druitt's death fit that timeline.

The case against him is almost entirely circumstantial. No physical evidence, witness account, or documented connection to Whitechapel or any of the victims has ever tied Druitt directly to the murders. Even Chief Inspector Frederick Abberline, one of the investigation's lead detectives, reportedly dismissed Druitt as a serious candidate, finding nothing beyond the coincidental timing of his death to support the theory.

Was Aaron Kosminski Jack the Ripper?

Kosminski, a Polish-Jewish immigrant working as a hairdresser in Whitechapel, is the suspect who has drawn the most sustained attention from modern researchers. Macnaghten's memorandum described him as having a documented hatred of women, particularly women working as prostitutes, along with strong homicidal tendencies, and noted he had been committed to an asylum not long after the murders stopped. Kosminski's psychiatric history is genuinely well documented; he was institutionalized multiple times, with symptoms consistent with what would today likely be diagnosed as paranoid schizophrenia.

What's less clear is whether any of that documented mental illness translated into actual violence. There's no record of Kosminski ever behaving violently during his time in asylums and hospitals, which complicates the idea of him carrying out five brutal murders shortly beforehand. Some researchers have also suggested Macnaghten may have confused Kosminski with a different Polish-Jewish Whitechapel resident of a similar age. A far more recent and considerably more contested piece of evidence, a claimed DNA link between Kosminski and a shawl reportedly recovered from one of the crime scenes, has renewed interest in him significantly in the last decade. That claim, and the serious scientific criticism it's attracted, is detailed in full in the next part of this series.

What About Michael Ostrog?

The third name on Macnaghten's list is, by most modern accounts, the weakest of the three. Ostrog was a Russian-born con man with a lengthy criminal record across Europe, mostly for theft and fraud rather than violence, and Macnaghten described him in his memorandum as a dangerous, homicidally inclined individual. Later research has significantly undercut this characterization. Records suggest Ostrog may have actually been incarcerated in France at the time several of the murders were committed, which, if accurate, would rule him out as a suspect entirely. Most contemporary researchers regard him as the least plausible of Macnaghten's three named suspects.

Could an American Doctor Have Been the Ripper?

Francis Tumblety, an American doctor with a controversial reputation and a documented fascination with collecting preserved human organs and body parts, drew serious attention from at least one senior investigator on the case. Tumblety was arrested in London in November 1888, though on unrelated charges, and skipped bail before fleeing back to the United States shortly afterward, a detail that has struck some researchers as suspicious in its timing. Chief Inspector Donald Swanson, one of the case's primary investigators, was reportedly a firm believer in Tumblety's guilt, even though Tumblety was never formally named a suspect by any official police report at the time. As with most suspects on this list, the case against him rests on circumstance and a documented interest that some find disturbing, rather than direct physical evidence connecting him to any specific victim.

Was It a Convicted Poisoner?

Severin Klosowski, a Polish immigrant who later went by the name George Chapman, worked as a barber in Whitechapel during the exact period of the murders. He's the only suspect on this list with a confirmed history of killing, he was hanged in 1903 for poisoning three of his wives using a slow-acting compound called tartar-emetic. Abberline, the same detective who dismissed Druitt, reportedly considered Chapman his personal favorite suspect and remained convinced of his guilt even after Chapman's execution for the poisonings.

The theory faces one significant obstacle: method. Poisoning and the kind of close-range physical mutilation carried out during the Whitechapel murders represent very different criminal profiles, and some researchers argue a killer capable of one wouldn't typically be capable of, or interested in, the other. Others counter that a documented willingness to kill repeatedly, in any method, is itself meaningful evidence worth taking seriously.

Was Jack the Ripper Actually Royalty?

Among the most sensational theories ever attached to this case holds that Prince Albert Victor, grandson of Queen Victoria and second in line to the British throne, was either the killer himself or was being protected by a wider cover-up involving the royal physician, Sir William Gull. Versions of this theory typically claim the murders were connected to an attempt to silence witnesses to a secret, scandalous relationship involving the prince.

This is also, by a significant margin, the theory with the least credible supporting evidence of any covered in this post. No contemporary document, investigation file, or credible historical record supports any version of the royal conspiracy theory, and most serious historians regard it as speculative fiction that gained traction largely through later books and films rather than genuine research. It's included here mainly because it remains one of the most widely recognized Ripper theories in popular culture, not because it holds up to scrutiny.

What About the Maybrick Diary?

In 1992, a diary surfaced claiming to be the confession of James Maybrick, a Liverpool cotton merchant, detailing his supposed crimes as Jack the Ripper. The diary's authenticity was disputed from the moment it became public, and forensic document examiners who've studied it since have raised serious concerns about the ink, the handwriting, and inconsistencies in the text that many consider strong evidence of a modern forgery. The overwhelming consensus among Ripper researchers today treats the diary as a hoax rather than genuine historical evidence, though it continues to generate debate and the occasional defender.

Weighing the Evidence

Of everyone covered in this chapter, Aaron Kosminski currently holds the most sustained interest among serious researchers, largely due to Macnaghten's own suspicion combined with genuinely documented mental illness and the more recent, if contested, DNA claims. Even so, no suspect on this list, including Kosminski, has ever been connected to the murders through anything approaching definitive proof. Every single name here relies on some combination of circumstantial timing, documented behavior that fits a general profile, or contemporary suspicion from investigators working without modern forensic tools.

That, more than any individual suspect, is the real story of this chapter: over 130 years and more than a hundred named candidates later, the Whitechapel murders remain exactly what they were the day Mary Jane Kelly's body was found, a case with strong circumstantial theories and no confirmed answer.

In the next part of this series, we'll look at what modern forensic science, including that contested DNA evidence, has actually been able to add to this case, and how close it realistically brings us to a real name.

Frequently Asked Questions

Who were the three suspects police officially favored? In an 1894 memorandum, Scotland Yard official Melville Macnaghten named Montague Druitt, Aaron Kosminski, and Michael Ostrog as the suspects he personally considered most likely, based on internal investigation files. None was ever formally charged.

Was Aaron Kosminski Jack the Ripper? Kosminski remains one of the most seriously considered suspects due to documented mental illness and hatred of prostitutes noted by investigators. However, there's no record of him ever behaving violently, and contested DNA evidence linking him to the case remains scientifically disputed.

Is the Prince Albert Victor royal conspiracy theory true? No credible historical evidence supports this theory. Most serious historians consider it speculative fiction that gained popularity through later books and films rather than genuine investigation records from 1888.

Was the James Maybrick diary a real Jack the Ripper confession? Most researchers and forensic document examiners consider the diary, which surfaced in 1992, to be a modern hoax, citing inconsistencies in the ink, handwriting, and text. It remains disputed, but it isn't widely accepted as genuine evidence.

Why has no Jack the Ripper suspect ever been definitively proven guilty? Victorian investigators lacked modern forensic tools like DNA analysis and fingerprinting, and evidence connecting any suspect to the murders remains largely circumstantial. Over 130 years later, no suspect has been confirmed through evidence meeting a modern legal standard.

Read the Full Jack the Ripper Investigation Series


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