The first conviction based on DNA evidence belongs to Colin Pitchfork, a British bakery worker sentenced at Leicester Crown Court on January 22, 1988, for the rape and murder of two teenage girls. A Florida rapist named Tommy Lee Andrews had actually been convicted using DNA evidence a few months earlier, in November 1987, making him the first in the United States. Pitchfork, though, is the name that dominates the history of forensic DNA, because his case was the first murder conviction built on genetic profiling and the investigation that produced it broke new ground at every stage.
The Narborough Murders
In November 1983, fifteen-year-old Lynda Mann was found raped and strangled near a footpath in Narborough, a village in Leicestershire, England. Investigators recovered forensic samples but had no viable suspect, and the case went cold.
Nearly three years later, in the summer of 1986, fifteen-year-old Dawn Ashworth was killed in strikingly similar circumstances in the neighboring village of Enderby. She had been raped and strangled after taking a shortcut along a path known locally as Ten Pound Lane. The method, the proximity, and the age of the victims pointed to a single killer.
Suspicion fell on Richard Buckland, a seventeen-year-old local man with learning disabilities who had been seen near Dawn Ashworth’s crime scene. Under questioning, Buckland confessed to her murder. Police wanted to confirm he was also responsible for the Mann killing, and they turned to a geneticist working just up the road at the University of Leicester.
How DNA Entered the Investigation
Alec Jeffreys had produced the first DNA fingerprint on September 10, 1984, working with highly variable repeated segments of DNA called minisatellites. The number of repeats differs from person to person, which means the resulting pattern is unique to almost everyone, with identical twins the only exception.1University of Leicester. What Sir Alec Did Next Jeffreys and his colleagues had developed a way to isolate those patterns using restriction fragment length polymorphisms, producing visual bands on film that could be compared between samples.2National Library of Medicine. Alec Jeffreys and the Pitchfork Murder Case Jeffreys had expected the technique to be used in paternity disputes and immigration cases. Within two years, Leicestershire police asked him to test it on a double murder.
Richard Buckland and the First DNA Exoneration
Jeffreys compared crime scene samples from both murders against Buckland’s blood. Two findings came out of that work: the same man had committed both rapes and killings, and that man was not Richard Buckland.2National Library of Medicine. Alec Jeffreys and the Pitchfork Murder Case
Buckland became the first person in criminal history cleared by DNA evidence. He had confessed. Without the test, a conviction would have been almost certain. The exoneration also meant the real killer was still at large, and police had no other leads.
The World’s First Mass DNA Screening
In early 1987, Leicestershire police did something no force had attempted before. They asked every man aged seventeen to thirty-four living in Narborough, Enderby, and Littlethorpe to voluntarily provide a blood or saliva sample. By March, around 2,880 samples had been taken. The operation eventually gathered more than 5,000. Roughly sixty officers worked on the effort, and for months, every sample tested came back negative.
The break came in a Leicester pub in August 1987. A woman overheard a man named Ian Kelly tell colleagues he had provided a sample on behalf of a coworker, a bakery worker named Colin Pitchfork. Pitchfork had told Kelly he could not give blood under his own name because he had already given one while impersonating someone else to dodge a prior indecent exposure charge. The woman went to the police.
Pitchfork’s Arrest and Conviction
Officers arrested Colin Pitchfork on September 19, 1987. A fresh blood sample was taken and sent for analysis. The result was unambiguous. Pitchfork’s genetic profile matched the samples recovered from both Lynda Mann and Dawn Ashworth. Confronted with the match, he confessed to both rapes and murders.
On January 22, 1988, Pitchfork pleaded guilty at Leicester Crown Court and was sentenced to life imprisonment with a minimum term of thirty years. An appeal later reduced the minimum to twenty-eight years. He was the first person ever convicted of murder on the strength of DNA profiling.3University of Leicester. DNA Fingerprinting
Where Colin Pitchfork Is Now
Pitchfork’s minimum term expired in 2016, but he has not been freed. The Parole Board approved his release in 2021, and he spent a short period in the community before being recalled to prison. In October 2025, the board rejected his latest application, finding that he posed a continued risk of reoffending, that he lacked sufficient internal controls to manage himself safely, and that his behavior in custody had revealed unexplored areas of risk. He remains in a closed prison as of that ruling.
The First U.S. DNA Conviction: Tommy Lee Andrews
While the Pitchfork investigation was still unfolding in England, DNA evidence made its American courtroom debut in Florida. On November 6, 1987, Tommy Lee Andrews became the first person convicted in a U.S. case involving DNA evidence. Andrews was a serial rapist whose attacks had terrorized Orlando. Investigators sent semen from a crime scene and blood drawn from Andrews to a New York laboratory, which isolated and compared the DNA and found a match. He was sentenced to twenty-two years in prison for rape, aggravated battery, and burglary.
The Andrews conviction came more than two months before Pitchfork was sentenced. A week after Andrews, on November 13, 1987, a Bristol man named Robert Melias became the first person convicted in Britain using DNA evidence, in a separate rape case.
Why Pitchfork Is Remembered as the Landmark
Andrews was first in the United States, and Melias was first in Britain, but neither case carries the weight of the Pitchfork investigation. The Narborough inquiry pioneered every major application of forensic DNA in a single sequence of events: the first use of DNA in a criminal case, the first exoneration of an innocent suspect, the first mass DNA screening, and the first murder conviction. It also demonstrated something that mattered to every DNA case that followed. The same test that proves guilt beyond reasonable doubt can also prove innocence with equal force, and in the Pitchfork investigation it did both before any jury was ever asked to decide.
Jeffreys’ original method required relatively large, intact DNA samples and took days to produce a result. Modern short tandem repeat profiling amplifies tiny regions of DNA through a chemical process, so a profile can now be generated from a trace amount of degraded material. The science has moved far beyond what was available in 1987. The case that opened the door has not been displaced.