The first case in this episode looks at the killing of 46-year-old Elaine Collie, who was found tortured and killed in her flat in Muirhouse, Scotland, in 1999. \n\nThe crime scene pointed to murder, and investigators discovered cash cards were stolen to withdraw money from Elaine’s bank accounts. A breakthrough comes when detectives analysing her phone records discover a call made to a local woman unconnected to Elaine. They find out that she lives with a partner, 40-year-old John Reid, but when they seek him out, he’s already in jail, arrested a few days earlier for being drunk and disorderly. It sounds like he had an alibi. \n\nBut when investigators seek the help of forensic pathologist Dr Basil Purdue, they discover the time of death was before Reid ended up in jail. \n\nThe police then discover Reid owns the flat right beside the victim and uses it for a mail drop – where his social security cheque is posted to. \n\nNow, they enlist the expertise of forensic scientist Shirley Marshall to search the flat for evidence that links Reid to the murder scene. Using DNA analysis, Shirley is able to prove that Elaine’s blood is found on rope, electrical cord and a tea towel, all found at the property. Further examination of the knots tied in the rope also point towards someone with a background around boats – Reid had previously worked as a fisherman in Dunbar. \n\nFaced with the overwhelming forensic evidence, Reid finally pleaded guilty and was given a life sentence. The case features interviews with Des Thomas, a former DCI at Lothian Borders Police, knot expert Richard Hopkins and Jason Collie, Elaine’s nephew. \n\nThe second case in the programme looks at one of the most extraordinary murder investigations in British history – the killing of reclusive couple Patricia and William Wycherley. \n\nIn 2013, police receive a call from an elderly lady claiming her stepson Christopher Edwards had contacted her and confessed to murdering his in-laws over a decade ago and that their bodies were buried in their back garden. \n\nWhen police and forensics teams dug up their bodies, the truth behind how they died became paramount, not to mention how their disappearance hadn’t been noticed for so long. \n\nWhen detectives finally caught up with Edwards, who was married to the couple’s daughter Susan, the level of deception became clear. Before selling the Wycherleys' home in 2005, Edwards would routinely visit the house and carry out maintenance suggesting the Wycherleys, who were rarely seen in by their neighbours, were still alive and well. The Edwards went so far as to send Christmas cards to relatives on the Wycherleys' behalf. \n\nBank records showed a possible motive, with Susan taking over and draining her parents’ accounts shortly after their murders. And she claimed to police that her mum had shot her dad after an argument, and in a tussle, Susan then shot her mum. Christopher Edwards had apparently only found out about the murders a week later when he went with Susan to supposedly visit her parents. It was then that they claimed he helped her bury the bodies. \n\nExpert witness Home Office pathologist Stuart Hamilton was tasked with unravelling the truth and proved that the testimony of Susan was flawed and the bodies were more likely buried straight after the murders. \n\nDetectives linked Susan and Christopher to the banking visits just two days after the murders, which backed Stuart’s theory up. And a final impromptu demonstration by Christopher Edwards – a gun club member – on how he would fire a weapon, eradicated the couple’s hopes for a manslaughter charge against Susan and a lesser charge against Christopher. \n\nBoth were convicted of murder and sentenced to 25 years in prison.
Source: BBC 1
Series 5: 4. The Killer Next Door
The first case in this episode looks at the killing of 46-year-old Elaine Collie, who was found tortured and killed in her flat in Muirhouse, Scotland, in 1999. \n\nThe crime ...
09-07-2026
BBC 1
Series 5: 2. Death On Duty
The first case in this episode looks at the investigation into the murders of two young police officers, Nicola Hughes and Fiona Bone. Both were gunned down when they were lured ...
09-07-2026
BBC 1
Series 5: 3. A Deadly Dose
The first case in this episode follows the baffling deaths of married couple Carol and Stephen Baxter, found slumped in chairs in their Essex conservatory on Easter Sunday 2023. ...
08-07-2026
BBC 1
Series 5: 1. Intent To Kill: The Ashley Dale Murder
The true crime documentary series that reveals how expert witnesses helped solve some of the UKs most complex major crime cases. \n\nThis episode starts in Liverpool, where 28 ...
07-07-2026
BBC 1
Series 4: 6. Murderers, Messages And The Breakfast Killer
In this episode, we take a look at how phone data can unlock a case and provide a solid link between the suspects and a horrific murder. \n\nIn early 2023, emergency call handle ...
24-04-2026
BBC 1
Series 4: 5. Catching A Cold Case Killer
Now more than ever, forensic science is opening up the possibility of catching criminals for crimes that have remained unsolved for years. In this episode, a case that had lain ...
23-04-2026
BBC 1
Series 4: 4. Cracking The Killer's Code
Our first case concerns a young man, Dolton Powell, fatally stabbed by an armed gang after a party. A group of suspects are arrested and questioned, but they remain tight-lipped ...
22-04-2026
BBC 1
Series 4: 3. The Wheelie Bin Killer
In our first case, father of four, Pat McCormick, goes missing in Comber, Northern Ireland, leaving his family desperate for answers. Police suspected he’d come to harm bu ...
21-04-2026
BBC 1
Series 4: 1. The Murder Of Sarah Payne: Fields Of Evidence
True crime documentary series that reveals how expert witnesses helped solve some of the UK's most complex major crime cases. \n\nThis programme travels to Sussex to investiga ...
20-04-2026
BBC 1
Series 1: 15. 60s Dna And Fibres Around The World
A 50-year-old cold case murder is solved by DNA and the tenacity of an expert witness, and a murder investigation is solved by tracking unusual blue fibres around the world.
13-06-2025
BBC 1
Series 4: 11. Blood On The Carpet
In 1976, Renee MacRae and her infant son Andrew are reported missing. The car they were travelling in is found on fire in a lay-by near Inverness. Neither will ever be seen agai ...
12-05-2025
BBC 1
Series 5: 2. Death On Duty
The first case in this episode looks at the investigation into the murders of two young police officers, Nicola Hughes and Fiona Bone. Both were gunned down when they were lured ...
09-07-2026
BBC 1
Series 2: 13. A Scottish Murder And Artful Deceit
An expert in mobile phone technology tracks the movements of a murder suspect, and an expert in art fraud determines whether a very expensive painting is genuine or fake.
07-06-2024
BBC 1
Series 2: 7. Body In The Bog And Bomb In The Boot
An expert witness uses soil analysis to find the body of a missing woman feared murdered, and a cell site expert uses his tracking skills to catch a killer in Northern Ireland.
28-05-2024
BBC 1
Series 4: 4. Cracking The Killer's Code
Our first case concerns a young man, Dolton Powell, fatally stabbed by an armed gang after a party. A group of suspects are arrested and questioned, but they remain tight-lipped ...
22-04-2026
BBC 1
Series 3: 8. Patterns Of Behaviour And Time Flies
A blood residue specialist leads police to the killers of an East Sussex waiter, brutally bludgeoned in his flat. And a forensic entomologist uncovers a case of extreme neglect ...
05-02-2025
BBC 1
Series 4: 3. The Wheelie Bin Killer
In our first case, father of four, Pat McCormick, goes missing in Comber, Northern Ireland, leaving his family desperate for answers. Police suspected he’d come to harm bu ...
21-04-2026
BBC 1
Series 1: 12. Pollen, Chalk And Dna
How expert analysis of nettles and soil helped catch the killer of the Soham schoolgirls Holly Wells and Jessica Chapman, and how advances in DNA techniques finally solved the m ...
12-06-2025
BBC 1
Series 2: 8. Late Night Murder And Exhuming Evidence
When a young nurse disappears, a soil analyst helps find her body and solve the crime. A digital imaging expert proves that what was thought to be an accidental death was murder.
29-05-2024
BBC 1
Series 5: 1. Intent To Kill: The Ashley Dale Murder
The true crime documentary series that reveals how expert witnesses helped solve some of the UKs most complex major crime cases. \n\nThis episode starts in Liverpool, where 28 ...
07-07-2026
BBC 1