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Fred and Rose West and their Gloucester 'House of Horrors' add up to one of the most disturbing murder cases in British criminal history.
In fact, it's now three weeks (well, two weeks and six days - not that we're counting) since its original screening date of 1 February, before the programme was axed due to 'legal reasons', leaving viewers angry following weeks of advertisement.
The documentary will explore new evidence about Rose West's role in the murders, which were unearthed 25 years ago when remains of the victims were first discovered.
The couple killed at least 12 women and girls - including their own children - over a 20-year period in Gloucestershire, before being apprehended and charged in 1994. At least eight of these murders involved rape, torture and mutilation.
The bodies were dismembered and were typically buried in the cellar or garden of the Wests' home - which was eventually dubbed the 'House of Horrors'.
The much-anticipated documentary will last an hour, featuring exclusive interviews and insights - even suggesting that Rose may have been the driving force behind the horrific crimes.
The never-before-seen interviews include footage of a former Cromwell Street lodger, a West family member and the sisters of one of the Wests' young victims.
Fred West killed himself in HMP Birmingham in January 1995, having been charged with 12 murders.
Rose remains behind bars at Low Newton prison in County Durham after being convicted of murdering 10 victims - including her daughter Heather, who was buried under the couple's garden patio.
She still denies her role in the murders but the documentary is believed to indicate that she shared the same violent tendencies as her husband, according to Devon Live.
Sir Trevor McDonald said of the documentary: "What viewers can expect is a great deal of information about how these extraordinarily horrible things came to pass. This is not an everyday story, you don't encounter this very often.
"In every way you turn to look at this case, there is something ghastly and unexpected and totally inexplicable. I've come away from doing this without any kind of intimation at all about how this was possible. It defies belief, it defies explanation and it defies any understanding. There is no conclusion, you just walk away stunned about what you learn."
Fred & Rose West - The Real Story with Trevor McDonald airs tonight at 9pm on ITV.
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