Case overview
On June 27, 1999, four members of a family were found bludgeoned to death in their home in Clydach, Wales. Mandy Power, her two daughters, and her mother were killed in an attack that left blood throughout the house and launched an investigation marked by conflicting evidence, suspect scrutiny, and a conviction that has been challenged for over two decades.
What happened that night
Mandy Power, 34, lived in a terraced house on Kelvin Road in Clydach with her daughters, Katie, 10, and Emily, 8. On the night of June 26, 1999, Mandy’s mother, Doris Dawson, 80, was staying over to help care for the girls. All four were attacked with a fibreglass pole in what investigators later described as a sustained and violent assault.
Mandy was found in her bedroom. Katie and Emily were discovered together in one of the upstairs rooms. Doris Dawson was found near the base of the stairs. The house had been set on fire in what appeared to be an attempt to destroy evidence, but the blaze was contained and did not spread beyond the lower level.
A neighbor reported the fire early on the morning of June 27. Firefighters arrived to find the front door unlocked and the victims dead inside. The scene was covered in blood, and initial reports described the attack as frenzied and brutal.
The investigation and early suspects
South Wales Police identified two men as persons of interest early in the investigation. The first was Alison Lewis, a former police officer who had been in a relationship with Mandy Power. Lewis had ended the relationship weeks before the murders, and investigators learned that Mandy had been involved with another man. Lewis was questioned extensively and became the subject of public suspicion.
The second person under scrutiny was David Morris, a local builder who had done work at Mandy’s home and was known to have visited the house in the weeks leading up to the killings. Morris had a criminal record and was considered a potential suspect early in the investigation.
Investigators found a gold chain belonging to Mandy Power in Morris’s home. A Swatch watch stained with blood was also recovered during searches connected to Morris. Forensic testing later identified the blood on the watch as belonging to one of the victims, though the watch itself was never definitively linked to Morris wearing it at the time of the murders.
The trial and conviction
David Morris was arrested and charged with four counts of murder in 2000. His trial began in 2002 at Swansea Crown Court. The prosecution’s case relied heavily on forensic evidence, including the bloodstained watch, the gold chain, and traces of blood found on a pair of Morris’s shorts.
The defense argued that the evidence was circumstantial and that investigators had failed to adequately pursue other suspects, particularly Alison Lewis. Defense attorneys pointed to Lewis’s familiarity with the house, his access to the victims, and the fact that he had been in the area on the night of the murders. They also noted that Lewis had washed his clothes and his vehicle shortly after the killings, actions that were never fully explained.
Morris maintained his innocence throughout the trial. He testified that he had been at home on the night of the murders and that he had no motive to harm Mandy Power or her family. The jury deliberated for several days before returning a guilty verdict on all four counts. Morris was sentenced to life in prison.
The appeals and ongoing dispute
Morris appealed his conviction multiple times. His legal team argued that the evidence used to convict him was flawed and that the trial had been compromised by media coverage and public pressure to secure a conviction. They also raised questions about the handling of forensic evidence, particularly the bloodstained watch, which they claimed had been contaminated or mishandled during the investigation.
In 2006, Morris’s first appeal was denied. A second appeal in 2016 was also rejected, with judges ruling that the evidence against him was sufficient to uphold the conviction. Morris’s supporters, including family members and advocacy groups, continued to argue that he had been wrongfully convicted and that Alison Lewis should have been charged.
Lewis was never prosecuted. He retired from the police force and has consistently denied any involvement in the murders. Investigators have stated that while Lewis was a suspect, the evidence against him was not strong enough to support charges.
The evidence that remains in question
The bloodstained watch remains one of the most contested pieces of evidence. Prosecutors argued that it placed Morris at the scene, but the defense maintained that the watch could have been contaminated or that the blood could have been transferred through other means. No forensic evidence definitively placed Morris inside the house at the time of the killings.
The gold chain found in Morris’s home was also disputed. Morris’s legal team argued that the chain could have been left behind during one of his earlier visits to the house and that its presence did not prove he was there on the night of the murders.
Investigators also recovered a sock with traces of blood and a pair of shorts with bloodstains from Morris’s residence. The defense questioned the integrity of the forensic testing and argued that the evidence could have been planted or mishandled.
What the case left unresolved
David Morris died in prison in 2021 while serving his life sentence. His death did not end the debate over his guilt. His family has continued to push for a review of the case, and several documentaries and news reports have examined the evidence and the investigation’s handling.
The question of whether the right person was convicted has remained central to discussions of the case. Supporters of Morris point to what they describe as investigative failures and a rush to judgment. Prosecutors and investigators have maintained that the evidence against Morris was strong and that the conviction was sound.
The case has also raised broader questions about how high-profile investigations are conducted and how forensic evidence is used in court. The attack on Mandy Power and her family remains one of the most scrutinized homicide cases in Wales, and the dispute over the conviction continues to shape how the case is remembered.
Where to look next
- Documentary: “The Clydach Murders” (BBC)
- Documentary: “The Investigator: A British Crime Story” (ITV)
- Book: “The Clydach Murders: A Miscarriage of Justice” by John Morris
