Boston StranglerAmerican serial killer who murdered at least 11 women in the Boston area between 1962 and 1964. His crimes were the subject of numerous books and a film, though the exact number of victims—as well as his identity—remains identity—proved a matter of controversy.

The Boston Strangler’s first victim, a 55-year-old woman, was sexually assaulted and strangled in her ransacked apartment on June 14, 1962. During the following months, several other women, ranging in age from 65 to 85 years, were murdered in similar circumstances, news of which engulfed the city in panic. The Boston police chief transferred nearly all his department’s resources to the search for the so-called “mother killer.” Then, in December, a young woman was killed, and three weeks later a 23-year-old woman was found strangled. Subsequent victims included women of a range of ages. By January 1964, 13 women were dead, and the Massachusetts attorney general, Edward Brooke, had taken charge of the investigation personally.

In 1965 Albert DeSalvo, an inmate at a state mental hospital who had a history of burglary dating from the 1950s, confessed to the murders. Although never actually charged with the killings (investigators at the time were unable to physically link him to the murder scenes), DeSalvo was convicted on charges of sexual assault and sentenced to life imprisonment. The case and DeSalvo’s life were portrayed in the 1968 film The Boston Strangler. DeSalvo was murdered in Walpole State Prison in 1973.

DeSalvo was viewed as a textbook case of a sexually motivated serial murderer, a seemingly ordinary man who was nevertheless capable of outbursts of savage violence. Yet DeSalvo’s guilt was controversial at the time and remained so in the decades after his death. His original confessions, for example, demonstrated ignorance of many aspects of the crimes. Although he would later describe details that only the actual killer could have known, his testimony, according to some observers, could have been based on information provided to him by police. Furthermore, several victims who survived did not believe he was their attacker.

At the beginning of the 21st century, DNA analysis of newly uncovered forensic evidence offered the possibility of determining whether DeSalvo was guilty of the last of the murders rape and murder of Mary Sullivan, the last victim commonly attributed to the Boston Strangler—one of the crimes to which he had confessedStrangler. Although testing conducted in 2001 seemed to prove had suggested that DeSalvo had was not responsible for the crime, in fact, been involved in that murder, subsequent examination suggested otherwise, and in 2013 investigators were granted permission to exhume DeSalvo’s remains for further evaluation.DNA analysis of his exhumed remains in 2013 proved, according to investigators, that he had in fact raped and murdered Sullivan. In light of the later findings, authorities concluded that DeSalvo “most likely” committed the other killings as well.