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And now, the channel are giving viewers the chance to see the real story behind the fascination investigation with a special documentary.
The team of key players that saw serial killer John Cooper finally face prosecution have come together for the first time to explain their roles in catching the perp.
The series will also see how the new detective team, and remarkable leaps in forensic science, finally put Cooper behind bars for life.
One aspect from the true-life case that has fascinated and stunned fans is the fact that John Cooper appeared as a contestant on the popular darts games show Bullseye shortly before he committed his second double murder.
While it can be dismissed as an intriguing piece of trivia that is stranger than fiction, Cooper's appearance on Bullseye is one of the most crucial moments at apprehending the killer.
Detective Steve Wilkins, who was the ambitious policeman who sought to catch the murderer, had been desperately looking for pictures of Cooper from the period to compare with an artist's sketch of the main suspect, and they had come up short before they found the Bullseye footage.
It's likely the new documentary will go into more detail about this amazing detail, as well as the other key points that make this story just so engrossing.
Hollywood star Luke Evans played Detective Steve Wilkins in the recent drama that told the Pembrokeshire Murders, with the series being lavished with praise from fans.
The series finale saw viewers becoming emotional with the powerhouse performances from the cast, with Keith Allen playing killer, Cooper.
"I cried watching the verdict. What an incredible drama. @TheRealLukevans, Keith Allen & all the cast just fantastic," tweeted one viewer.
A second added: "The #PembrokeshireMurders drama was absolutely compelling TV. Outstanding performances by the two main actors Luke Evans and Keith Allen."
"Not usually a fan of true story dramas but the #PembrokshireMurders was a gripping yet chilling watch fronted by the brilliant Luke Evans," said a third.
The Pembrokeshire Murders: Catching the Gameshow Killer airs Thursday 14th January at 9pm on ITV.
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