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Viewers of new ITV drama The Pembrokeshire Murders were left on the edge of their seats over a huge cliffhanger at the end of this evening's episode.

The three-part series follows newly promoted Detective Superintendent Steve Wilkins, played by Luke Evans, taking the reins of a cold murder case from the 80s.

In 1985, siblings Richard and Helen Thomas were slain in a double killing and just four years later, Peter and Gwenda Dixon were murdered.

Footage from Bullseye showed what John Cooper looked like in the 80s
(Image: ITV)

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The murders were known as the Pembrokeshire murders, or the Pembrokeshire Coastal Path murders, but Welsh serial killer John Cooper was convicted in May 2011 of the double murders.

At the end of tonight's episode, DS Wilkins managed to unearth footage of Cooper on gameshow Bullseye, which revealed what he looked like just a month after committing the horrific double murder.

In the police interrogation, Cooper had claimed that the police sketch of the assailant, made in the 80s, had not looked like him as he hadn't worn his hair that long.

He also refused to provide a photo of how he looked at the time – but the clip showed that Cooper had lied about his appearance.

(Image: ITV)

(Image: ITV)

Meanwhile, at his home, a 999 call was made – though there was no response to the operator.

One fan tweeted: "Oooh roll on tomorrow…hope they nab him..what a way to end episode 2!!! and yes luke Evans is so hot Fire #pembrokeshiremurders."

While another commented: "Watched second episode of #pembrokeshiremurders so chilling."

A third wrote: "Much better episode today, but what a cliff hanger.. need tomorrow’s episode NOW! #pembrokeshiremurders."

*The Pembrokeshire Murders concludes tomorrow night at 9pm on ITV