The Boston Strangler Case: Inside the Murders That Terrified a City and the DNA Twist That Solved It Decades Later

 

There was a time when Boston felt like the kind of place where nobody bothered locking their front door. People knew the family next door by name. A single woman could walk home after an evening out and not think twice about it. That sense of ease didn't disappear overnight — but once it started slipping away in the summer of 1962, it never really came back the same.

Over the following year and a half, the city found itself gripped by a fear it had never experienced before. Women were turning up dead inside their own homes, and nobody could explain how the killer was getting in.

A String of Murders With No Clear Answers

Between June 1962 and January 1964, Boston recorded at least eleven murders that investigators eventually linked together — though some researchers believe the real number may have climbed as high as thirteen. The victims ranged enormously in age, from a teenager barely out of her teens to an elderly woman of 85, which only added to the sense that no one was truly safe.

What made the killings so unsettling wasn't just the violence itself, but the pattern behind it. There were no broken windows, no forced doors, no obvious signs of a break-in. Somehow, the killer was getting inside without a struggle at the entrance. Each case followed a similar, grim sequence: the victim was sexually assaulted and then strangled. In several instances, the attacker left behind an eerie calling card — a stocking or scarf, deliberately tied into a bow around the victim's neck.

It didn't take long for the murders to change everyday life acro

ss the city. Women who had lived alone for years suddenly started searching for roommates out of pure caution. Hardware stores and locksmiths couldn't keep pace with the sudden demand for stronger locks and deadbolts. Local police stations began holding self-defense workshops just to give residents some sense of control. Newspapers ran near-daily coverage, feeding a public that was equal parts terrified and desperate for answers police simply didn't have yet.

The Confession Nobody Expected

The investigation dragged on for nearly three years without a real breakthrough. Then, in 1965, everything shifted in an unexpected direction.

Albert DeSalvo, a 33-year-old handyman and former Army serviceman, was already sitting in custody at the time — not for the stranglings, but for an unrelated series of sexual assaults that had become known as the "Green Man" attacks. Out of nowhere, DeSalvo began confessing to all eleven of the Boston Strangler murders.

What struck investigators most wasn't just that he confessed — it was how much he seemed to know. He reportedly described the layout of apartments he had no obvious reason to be familiar with, along with small personal details about victims that felt far too specific for a random confession.

And yet, in one of the strangest turns in American criminal history, Albert DeSalvo was never actually tried for the Strangler killings. His attorney, F. Lee Bailey — who would go on to become one of the most recognizable defense lawyers in the country — worked out an arrangement in which DeSalvo was sentenced to life in prison, but for the earlier robbery and assault charges rather than the murders he'd confessed to. The Strangler case, in a legal sense, simply never went to court.

DeSalvo spent the rest of his life behind bars. Before his death in 1973 — he was stabbed inside Walpole State Prison — he had already walked back his own confession, insisting to those around him that he hadn't actually killed anyone.

A Case That Refused to Stay Closed

Once DeSalvo recanted, the tidy narrative of a "solved" case started to fall apart. Plenty of criminologists were never fully convinced he was the real killer, and several victims' families felt the same unease. Some researchers argued the murders showed inconsistencies that pointed toward more than one person being involved rather than a single perpetrator working alone.

That skepticism found a public voice in Casey Sherman, whose aunt Mary Sullivan — just 19 years old — is widely regarded as the Strangler's last victim. Sherman spent years digging into the case and eventually wrote a book laying out his doubts, arguing that the evidence didn't cleanly point to DeSalvo acting alone, if he was involved at all. Early DNA testing done in 2001 only added fuel to that uncertainty, hinting that DeSalvo might not have been the source of crime scene evidence.

For decades, the question of who actually killed those women sat unresolved, treated by many as one of the great unanswered mysteries in American crime history.

Technology Finally Catches Up

The turning point came in 2013, when forensic science had advanced enough to revisit evidence that had sat untouched for years. Boston Police investigators went back to DNA samples collected from the Mary Sullivan crime scene, hoping new testing methods could finally extract something usable.

Rather than exhuming DeSalvo right away, investigators took an indirect route. They located one of his living relatives, discreetly collected a water bottle he'd used, and compared the Y-chromosome DNA on it to the crime scene sample. The results lined up — a familial match strong enough to justify the next, more dramatic step.

With that evidence in hand, authorities secured a court order to exhume Albert DeSalvo's remains. DNA pulled from his bones and teeth was tested directly against the decades-old evidence from Mary Sullivan's case. The statistical result was almost hard to comprehend: experts calculated the odds that the DNA belonged to someone other than DeSalvo at roughly one in 220 billion — a number that dwarfs the entire population of people who have ever lived. Suffolk County District Attorney Daniel Conley described the match as definitive.

Still, officials were careful not to overstate what the science actually proved. The DNA conclusively tied DeSalvo to one murder — Mary Sullivan's. None of the other ten killings had matching DNA evidence to test, meaning investigators could only say it was "most likely" that DeSalvo was responsible for those as well, not that it was scientifically confirmed.

A Case Study in Imperfect Justice

More than just a chapter in serial killer history, the Boston Strangler case has become something of a case study in how imperfect the justice system can be. A man gave a detailed confession to eleven murders — and was never tried for a single one of them. Half a century later, DNA science finally answered part of the mystery, yet the full picture still isn't complete.

To this day, criminologists and true-crime writers continue debating whether one man really was responsible for all eleven or thirteen murders, or whether Boston was actually dealing with more than one killer during that terrifying stretch of the early 1960s. It's a question that may never get a final, satisfying answer.

What isn't up for debate is the lasting impact those months had on the city itself. An entire generation of Bostonians came out of that period thinking differently about locked doors, trusted neighbors, and what safety at home actually meant — and the case remains, even decades later, one of the most discussed stories in American true crime.