Detective Chief Inspector Rob Griffin, from the East Midlands Major Crime Unit, has told ITV News Central Susan and Christopher Edwards displayed a heartless attitude from the moment they were arrested.
Susan Edwards sent Christmas cards to relatives of her parents in order to convince people they were still alive.
The cards described how the couple were enjoying travelling around Ireland, when in fact they have been shot dead and buried under the garden of their home.
Susan Edwards, 56, and her husband Christopher, 56, were found guilty of murdering Patricia and William Wycherley at Nottingham Crown Court.
The bodies of the Wycherleys were unearthed from the back garden of their home in Mansfield, Nottinghamshire, last October.
Susan and Christopher Edwards have been told they will each receive a life sentence for the murder of Susan's parents.
ITV News Reporter Ben Chapman is in court.
Judge tells Susan & Christopher Edwards they each receive a life sentence. Their minimum term will be decided on Monday pm. @itvnews
In all Susan & Christopher Edwards stole nearly £250,000 from their dead victims to pay off their debts and fund their lifestyle. @itvnews
Susan and Christopher Edwards have been convicted of murdering her parents. The bodies of William and Patricia Wycherley were discovered in the back garden of a house on Blenheim Close at Forest Town in Mansfield last October.
They were murdered 15 years before, in May 1998. Susan Edwards had admitted manslaughter but denied murder. More to follow.
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Susan and Christopher Edwards are charged with killing her parents William and Patricia Wycherley between the 1st and 5th May 1998.
Last October their remains were found buried in the back garden of their home on Blenheim Close at Forest Town in Mansfield.
A post-mortem revealed they had been shot.
Susan Edwards has pleaded guilty to the manslaughter of Patricia Wycherley. But both she and her husband Christopher Edwards deny murder.
The couple previously admitted to burying the Wycherley's in the back garden and obstructing the coroner in the execution of his duty.
A Big Lunch is being held at King George V Park in Mansfield today. The organisers of the event are trying to show how much food the average family wastes a year.
The feed the 1,000 challenge will aim to feed most people visiting the park on the average amount of money a family wastes a year - £700. Across the UK the average amount of money spent on food that ends up in landfill is around £12 billion.
Mansfield District Council are asking people to be on the look out for illegal tattooists, known as Scratchers.
There have been numerous complaints from licensed tattooists who have reported they have noticed an increase in the number of scratchers working illegally.
Illegal tattooists do not conform to the high safety standards required, with one unlicensed tattooist wrongly believing that printer ink was safe to use. Printer ink contains high levels of metals and could lead to blood poisoning and infection.
Portfolio Holder for Public Protection at Mansfield District Council, Cllr Mick Barton said:
We are stepping up our efforts to track down illegal operators. Under the Tattoo of Minors Act, it is illegal to tattoo someone under the age of 18.
Young people are particularly at risk and we would like both schools and individuals to come forward if they are aware of any illegal practices, so we can investigate.
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Nottinghamshire golfer Lee Westwood has won the Malaysian Open in Kuala Lumpur.
It's the Mansfield man's 13th Asian win, and his first since his European Tour win in 2012.
He finished 18 under par after 72 holes,