Quick answer: The most famous unsolved murder mysteries in history include Jack the Ripper, the Lizzie Borden case, the Villisca axe murders, Hinterkaifeck, the Black Dahlia, the Somerton Man and the Zodiac Killer. Each stayed open for a clear reason: a disturbed crime scene, no timeline to test suspects against, or so much publicity and false information that real leads were lost.
A scenario: A fictional case night has just ended. The envelope is open, the culprit named, and everyone is pleased with themselves. Then someone asks a quieter question: do real cases ever end this neatly? Talk drifts to the cases history never closed, and the table moves from celebrating to wondering how much an investigation hangs on evidence protected, or lost, in its first few hours.
Key takeaways
- These are real cases with real victims; they are worth studying with respect, not as entertainment.
- Most stayed unsolved because something basic was missing, not because the killer was a genius.
- Contaminated scenes, untestable timelines and floods of false tips are the recurring problems.
- Modern methods such as genetic genealogy have answered some questions, but not all.
Fiction promises that every mystery has an answer. History doesn't. Some of the most famous murder cases on record were worked by hundreds of people, covered in thousands of articles and argued over for more than a century, and they're still open.
These cases are not puzzles. Real people died, and their families lived with not knowing. They are worth studying because they show plainly what an investigation needs to succeed, and what happens when one piece is missing. Below are seven of the best-known unsolved cases, kept to well-documented facts, each with a short note on why it never closed.
Jack the Ripper (London, 1888)
In the autumn of 1888, a series of women were murdered in the Whitechapel district of London's East End. Five are usually called the "canonical" victims: Mary Ann Nichols, Annie Chapman, Elizabeth Stride, Catherine Eddowes, and Mary Jane Kelly. The press, fed by letters claiming to come from the killer, made the case an international sensation. The name "Jack the Ripper" comes from one of those letters, which many historians believe a journalist wrote.
Police interviewed hundreds of people and named several suspects in internal notes, but nobody was ever charged. Over the following century, amateur investigators proposed well over a hundred candidates.
Why it stayed open: Victorian policing had no fingerprint system, almost no forensic science, and crowds routinely trampled crime scenes. The flood of hoax letters buried whatever real leads existed.
Lizzie Borden and the Fall River murders (Massachusetts, 1892)
On August 4, 1892, Andrew Borden and his wife Abby were killed in their home in Fall River. Andrew's daughter Lizzie, who was in the house, was arrested and tried the following year. The jury acquitted her after a short deliberation. No one else was ever charged.
A grim schoolyard rhyme keeps the case alive in American folklore, but the trial record is the better story. It turned on missing evidence: a dress Lizzie burned days later, a hatchet head from the basement that couldn't be firmly tied to the crime, and a trip to the barn nobody could confirm or disprove.
Why it stayed open: The prosecution had motive and opportunity but no physical proof. Public opinion long ago decided the case, yet the courtroom never proved it.
The Villisca axe murders (Iowa, 1912)
On the night of June 9 to 10, 1912, eight people were killed in a house in the small town of Villisca, Iowa: Josiah and Sarah Moore, their four children, and two young girls from the Stillinger family who were staying the night. A neighbor discovered the crime the next morning.
Word spread fast, and so many townspeople walked through the house that the scene was ruined before any serious investigation began. Several suspects were considered, and one, a traveling preacher, was tried twice. The first trial ended in a hung jury, the second in acquittal.
Why it stayed open: A contaminated scene and a small-town police force with no experience of anything on this scale. Many modern readers first meet the case through the house itself, which still stands.
Hinterkaifeck (Bavaria, 1922)
In spring 1922, six people were found dead on a remote farmstead called Hinterkaifeck, north of Munich. The days before are what haunt this case. The farmer reportedly told neighbors about footprints in the snow leading toward the farm but not away, noises in the attic, and a newspaper he didn't recognize. After the deaths, evidence suggested someone may have stayed on the farm for days, feeding the animals.
Investigators questioned many people over the decades. Nobody was ever convicted.
Why it stayed open: Isolation. With no close neighbors and no reliable witnesses to the critical days, there was no timeline to test anyone against.
The Black Dahlia (Los Angeles, 1947)
In January 1947, the body of Elizabeth Short, a 22-year-old woman, was found in a vacant lot in Los Angeles. Newspapers named her "the Black Dahlia," and the case became one of the most publicized in the city's history.
Los Angeles police investigated a very large number of people, and dozens came forward to confess, all falsely. Theories have kept coming ever since, including books by relatives of suspects. None has been proven.
Why it stayed open: Intense press coverage produced false confessions and a flood of bad tips, while the physical evidence available in 1947 was limited. The noise drowned the signal.
The Somerton Man (Adelaide, 1948)
On December 1, 1948, a man was found dead on Somerton Beach near Adelaide, Australia, carrying no identification. Months later, a tiny scrap of paper turned up in a hidden pocket of his trousers, printed with the words "Tamám Shud," meaning "ended" or "finished," torn from a copy of the Rubaiyat of Omar Khayyam. The matching book, once found, held a short series of letters that some read as a code. It has never been convincingly deciphered.
For more than seventy years, nobody knew who he was. In 2022, a researcher working with genetic genealogy announced a likely identification: a Melbourne electrical engineer named Carl "Charles" Webb. That answered the "who," but how he died, and whether anyone else was involved, remains unknown. Strictly, this is an unexplained death rather than a confirmed murder, but it belongs on any list of history's great open cases.
Why it stayed open: No name, no agreed cause of death, and a clue so strange it pulled attention away from the basic questions.
The Zodiac Killer (Northern California, late 1960s)
In the late 1960s, a killer attacked people in the San Francisco Bay Area, then taunted police and newspapers with letters signed "Zodiac." Some letters contained ciphers. A schoolteacher and his wife solved one within days. Another, the "340 cipher," resisted decoding for fifty-one years until a team of amateur codebreakers cracked it in December 2020. Its message did not reveal the writer's name.
Several suspects have been named over the years, but none has been officially confirmed.
Why it stayed open: Attacks across several jurisdictions, each with its own police department and files, made one coherent picture hard to build. It's a textbook example of why modern investigations share evidence across agencies.
The seven cases at a glance
| Case | Place and year | Main reason it stayed open |
|---|---|---|
| Jack the Ripper | London, 1888 | No forensic science, disturbed scenes, hoax letters |
| Lizzie Borden | Fall River, Massachusetts, 1892 | Motive and opportunity, but no physical proof; acquittal |
| Villisca axe murders | Villisca, Iowa, 1912 | Scene ruined by visitors before investigation |
| Hinterkaifeck | Bavaria, 1922 | Remote farm, no witnesses for the critical days |
| The Black Dahlia | Los Angeles, 1947 | False confessions and a flood of bad tips |
| The Somerton Man | Adelaide, 1948 | No identity for decades; cause of death unclear |
| The Zodiac Killer | Northern California, late 1960s | Several jurisdictions, scattered files |
What these cases have in common
Line them up and a pattern appears. The killers were not geniuses. Each case stayed open because one of three things was missing:
- A clean scene. Villisca and the Whitechapel murders were compromised before evidence could be gathered.
- A testable timeline. Hinterkaifeck and the Somerton Man lacked witnesses who could fix people in time and place.
- A signal-to-noise ratio investigators could work with. The Black Dahlia and Zodiac cases were buried under false confessions, hoaxes, and publicity.
How to read about real cases responsibly
Unsolved cases attract endless theories, many naming real people who were never charged. A few habits keep the interest honest:
- Prefer primary and well-sourced accounts. Court records, inquest reports and reputable historians beat viral videos.
- Separate fact from theory. "Police questioned him" is not "he did it." Keep the two apart, as you would in a case file.
- Remember the families. Many victims have living relatives. Skip graphic details and speculation that adds nothing.
- Be wary of "solved" headlines. New claims appear regularly; most are not accepted by investigators or historians.
That gap is why fictional mysteries satisfy. A well-designed case gives you the clean scene, the timeline, and the one record that breaks a lie. To see how modern investigators revisit old cases, read our post on cold case investigation techniques. For how games handle real events versus invented ones, see true crime vs. fiction detective games.
Solving the ones that can be solved
We don't turn real victims into games. Every case at Forgotten Mystery is fictional, written so it has one fair answer hidden in police reports, camera timestamps, bank records and interrogation transcripts. If history's open cases leave you wanting to close one yourself, start with our free case.
FAQ
What is the most famous unsolved murder in history?
Jack the Ripper is almost certainly the most famous. It has inspired more books, films, and theories than any other unsolved case.
Has DNA solved any famous old cases?
Genetic genealogy has helped identify unknown people and suspects in many cold cases in recent years, including the likely identification of the Somerton Man in 2022. For very old cases, usable evidence often no longer exists.
Was the Zodiac cipher ever solved?
Two of the Zodiac's ciphers have been solved: one in 1969 and the "340 cipher" in December 2020. Neither revealed the killer's identity.
Why do some cases stay unsolved for so long?
Usually because the original evidence was lost, contaminated, or never collected, and because witnesses die or memories fade. Time works against investigators.
Was Lizzie Borden guilty?
A jury acquitted her in 1893, and no one else was ever charged. Historians still disagree, which is why the case is usually described as officially unsolved.