The Pembrokeshire Murders refer to two double homicides committed by serial killer John William Cooper in 1985 and 1989, which remained unsolved for over two decades. The first attack took place on December 22, 1985, at Scoveston Park, where siblings Richard and Helen Thomas were shot at point-blank range before their farmhouse was set ablaze. The second occurred on June 29, 1989, involving Oxfordshire couple Peter and Gwenda Dixon, who were murdered while walking the Pembrokeshire Coastal Path near Little Haven. For years, the cases were among the UK’s most haunting cold cases until Operation Ottawa, a specialized cold case review launched in 2006 by Detective Superintendent Steve Wilkins, utilized advanced DNA profiling and archival television footage from the game show Bullseye to secure a conviction. Cooper, often dubbed the “Bullseye Killer,” was eventually sentenced to a whole life order in May 2011 after forensic scientists found a microscopic speck of a victim’s blood on his clothing.
The Scoveston Park Murders (1985)
The first of Cooper’s double murders was characterized by extreme violence and a sophisticated attempt to destroy forensic evidence.
The Attack on the Thomas Siblings
On December 22, 1985, John Cooper targeted the remote three-story farmhouse of Richard Thomas (58) and his sister Helen (54) at Scoveston Park, Milford Haven. Both victims were shot in the face with a shotgun before the property was systematically set on fire to hide the crime.
Initial Investigation Challenges
Despite a team of 100 officers, the 1985 investigation was hampered by the sheer scale of fire damage, which destroyed most biological evidence. At the time, the police lacked the DNA technology required to link the crime to a specific suspect, leading the case to grow cold despite Cooper’s name appearing on early lists of local violent offenders.
The Coastal Path Murders (1989)
Nearly four years later, Cooper struck again in a location that would eventually provide the clues for his downfall.
The Murder of Peter and Gwenda Dixon
Peter and Gwenda Dixon were on the final day of their camping holiday in June 1989 when they encountered Cooper on the Pembrokeshire Coastal Path. Cooper forced the couple to disclose their bank PIN at gunpoint, robbed them of £300, and executed them at point-blank range before concealing their bodies in heavy undergrowth.
The 1989 Police Sketch
Witnesses near the scene reported seeing a man with a “shoulder-length mullet” and distinctive khaki shorts using the Dixons’ bank card at a cash machine. This led to a famous police sketch (photofit) that would play a vital role in the investigation two decades later.
Operation Ottawa: The Cold Case Review
In 2006, Detective Superintendent Steve Wilkins founded Operation Ottawa to re-examine the Pembrokeshire cases using modern science.
Advanced Forensic DNA Testing
Forensic scientist Angela Gallop and her team utilized new techniques to re-examine 3,000 items of evidence seized from Cooper’s home in the 1990s. They discovered a microscopic drop of Peter Dixon’s blood trapped in the hem of a pair of khaki shorts, as well as fibers from the Dixons’ clothing on Cooper’s shotgun.
The Bullseye Breakthrough
A pivotal moment occurred when investigators discovered that John Cooper had appeared on the ITV game show Bullseye just one month before the 1989 murders. By freezing a frame of Cooper on the show, they were able to overlay his image with the 1989 police sketch, proving a near-perfect match in both physical appearance and clothing.
Trial and Conviction of John Cooper
After years of meticulous evidence gathering, the “Bullseye Killer” finally faced justice.
The 2011 Trial
The trial at Swansea Crown Court depicted Cooper as a “cold and calculating” psychopath who killed for “pitiful financial gain.” The jury was shown how Cooper used his knowledge of the Pembrokeshire hedgerows to hide stolen items and evade police during his decades-long spree of burglaries and sexual assaults.
Sentencing and Appeals
On May 26, 2011, John Cooper was found guilty of four counts of murder and several counts of rape and sexual assault. He was given a whole life order, meaning he will never be released from prison. As recently as 2023, Cooper applied for an appeal, which was subsequently rejected by the Criminal Cases Review Commission (CCRC).
Practical Information for True Crime Tourists
Many visitors now travel to Pembrokeshire to see the locations made famous by the case and the subsequent television drama.
Key Locations to Visit
Pembrokeshire Coastal Path: The section between Little Haven and St Brides is where the Dixon murders occurred; it remains a stunning, albeit somber, hiking route.
Milford Haven: The town where Cooper lived and where many of his earlier crimes took place.
Thomond Park (Drama Filming): While the drama was filmed across Pembrokeshire, many interior scenes were shot in local studios.
Visitor Tips
Safety First: The coastal path has steep cliffs; always stay on marked trails and check weather conditions before heading out.
Respectful Tourism: Remember that these locations are sites of real tragedy; visitors are encouraged to be respectful of the local community and the victims’ families.
Museums and Archives: Local libraries in Haverfordwest hold extensive newspaper archives from the 1980s for those researching the case.
FAQs
Who were the victims of the Pembrokeshire Murders?
The victims were siblings Richard and Helen Thomas (1985) and husband and wife Peter and Gwenda Dixon (1989).
How was John Cooper caught?
He was caught through a combination of modern DNA forensics (finding a speck of blood on his shorts) and his 1989 appearance on the game show Bullseye, which matched a police sketch.
What is the “Operation Ottawa” investigation?
Operation Ottawa was the 2006 cold case review led by Detective Superintendent Steve Wilkins that successfully linked John Cooper to the unsolved double murders.
Is John Cooper still alive?
As of March 2026, John Cooper is alive and serving a whole life sentence in a UK prison. He is currently 81 years old.
What other crimes did John Cooper commit?
Beyond the murders, Cooper was convicted of 30 burglaries, an armed robbery, and the rape and sexual assault of teenagers in 1996.
Why is he called the “Bullseye Killer”?
He earned the nickname because his appearance on the darts-themed show Bullseye provided the visual evidence needed to identify him as the suspect from the 1989 sketch.
Can I watch a show about the murders?
Yes, ITV produced a three-part drama titled The Pembrokeshire Murders starring Luke Evans, as well as a documentary called Catching the Game Show Killer.
Did John Cooper win anything on Bullseye?
No, he did not win the star prize, but his appearance became famous for his comment about his extensive knowledge of the Pembrokeshire coastline, where he committed his crimes.
What evidence was found on his shorts?
Forensic scientists found a microscopic drop of Peter Dixon’s blood and fibers from the Dixons’ clothing embedded in the seams of Cooper’s shorts.
Has John Cooper ever admitted to the murders?
No, John Cooper has consistently maintained his innocence and has attempted multiple appeals against his conviction.
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