The couple were shot dead at point blank range with a shotgun in an execution-style killing, and their killer had attempted to hide their bodies in the cowshed of the farm.

Harry and Megan Tooze were an elderly couple who lived together on a remote farm just north of Llanharry in South Wales.

[5] Harry was well known in the community through his market garden business, although he had retired seven years previously when the couple's only daughter, Cheryl Tooze, had also moved away.

[3] Around a year before the murders, in 1992, Harry's shotgun, which he used to shoot rabbits that were attempting to eat his cabbages, was mysteriously stolen from the farm.

[2] That evening, when her nightly phone call again went unanswered, Cheryl alerted her parents' neighbours, who in turn summoned the South Wales Police.

He knew their daily habits, their property and its layout" Murder-suicide was quickly ruled out when drag marks believed to have been made from a body were found going from near the farmhouse to the cowshed.

[4] A forensic and ballistics analysis determined Harry had been shot just inside the door of the cowshed, after which he was placed in a trough and covered with hay and tarpaulin sheets in order to conceal the body.

[4] At first it was thought that the shooting might have been a professional hit, but ballistics experts reckoned that determination may have been all which was needed to carry out the murders successfully.

[4] Because Harry's body showed evident hypostasis on the side he was not found lying on, it was concluded he had been moved three to four hours after he had died.

[4] Megan's body showed hypostasis in a much smaller amount, possibly suggesting that she may have been killed some time after Harry.

[4] The murder weapon was not located, and the investigative team initially focused on the possibility that the Toozes had disturbed an intruder.

[4] On 28 September 1993, two months after the murders, a reconstruction and appeal was shown on the BBC's Crimewatch, where it was asked that the unknown visitor to the farmhouse come forward to eliminate themselves.

[3] At the time of the murders, Cheryl lived with her boyfriend Jonathan Jones in Orpington, Kent, although they often visited the Toozes' farm in Llanharry.

[4] Jones, also from Wales, had been trying to make it as a recruitment consultant, but his attempts were failing and he had instead decided that he would start his own marketing business, even though he only had £100 in his bank account.

[4] Harry and Megan had a £150,000 life insurance policy, which investigators believed gave Jones a motive for the murders.

[8] Police were informed by numerous witnesses about a man seen walking along a road near the Tooze farm in late June, wearing a beige trench coat and dark sunglasses.

[4] Jones' alibi for the day of the murders was that he had taken that Monday off to look for new office premises for his marketing business in Orpington, meeting with estate agents.

[4][8][6] It was discovered that the return trip from Orpington to Llanharry and back would have taken a maximum of seven hours by car or train, giving Jones enough time to commit the murders that day.

[4] Further undermining the alibi was the fact that Jones had failed to return a rented videotape that was due back at a shop along the route he claimed to have walked that day, and because the exact time frame the experts suggested the murders took place (between 1:30 and 3:00 pm) were the exact times Jones stated he was at home.

[9] When Cheryl had become concerned about her parents not answering the phone that evening, she asked Jonathan to drive the 200 miles (320 km) to Llanharry to check up on them, purportedly unable to go herself as she had to work the following morning.

[4][8] Cheryl Tooze said she was dismayed by the verdict and offered a £25,000 reward for information from the public that would support her boyfriend's alibi and prove him innocent.

"[10] Jones decided to appeal on a number of grounds, including technical claims that the judge had misdirected the jury in his summing up.

[4] His team tried to find evidence to support his claim that he had spoken to lift engineers in the flat that day, although these individuals still maintained that he had not.

[8] In 2000, with the murders legally unsolved, two reviews of the case were carried out, although the results of these have never been made public so as to not influence any potential future trial or re-trial.

[13] That year, after a new search, police also found shotgun cartridges in a flooded iron ore mine shaft on nearby land.

[4] DCI Evans revealed that the original investigation had been given an anonymous tip-off that items had been dumped down a nearby mine shaft, but they had been unable to search then as they did not have permission.

[13] In 2006 new witnesses came forward about the cars seen, but in 2008 South Wales Police said that all lines of inquiry had been exhausted and the investigation was reduced.

[5][1] Some similarities with Cooper's known murders were noted, including the fact that both victims were shot at close range and attempts were made to hide their bodies.

[5] In 1999, Jones met up with Eddie Browning, the man convicted and then controversially freed of the murder of Marie Wilks in 1988.