One of the stars of 5's documentary series Motorway Cops has revealed why he wanted to bring the story in Prime Video's latest true crime documentary series, Murder In Cement, to screens. Anton Sullivan was heavily involved in the investigation into the murder of Christophe Borgye. Due to his fluency in French, he was able to act as the family liaison officer and help with translations, and the case went on to become a huge part of his career.

Speaking exclusively to Express.co.uk he explained how the streamer got involved. "The family gets on with their lives (after the hearings). I got on with mine, but this all struck a chord and has been a large part of my career since 2012. It affected me personally, not in a bad way, but it became part of who I am and made me probably a better police officer. And I thought this was a story that needed telling, because people know about the offenders. The victims tend to get lost sometimes in the media story. I thought it was worthy of a legacy for the victim and the family. 

"So I was in the Motorway Cops series for four seasons and I met a number of producers, and I told a couple of them stories. I thought this would make a good opportunity for them.

"It's got all the elements of an interesting story, one that people would want to see, but also gets the story out there and humanises the victim again, rather than just being a black and white picture in the paper,” he said.

The extraordinary story tells how a French-speaking man, Sebastian Bendou, called into a police station in northwest England in 2013 and confessed to killing his housemate, Ryanair employee Christophe Borgye, in self-defence in 2009.

This led to the discovery of a body buried in a concrete tomb and triggered an investigation that revealed there was far more to the story than the confessor led them to believe. The tangled tale was ultimately unravelled by investigators, and Bendou and two others, Manuel Wagner and Dominik Kocher, were jailed for his murder, with Kocher deemed to be the ringleader.

The trials were complex and caused the family enormous stress. However, Anton feels that the convictions have allowed them to move on, at the very least.

"They know what's happened to him. Now, any doubt has gone. I don't believe there's such a thing as closure," he reflected.

"What it will now allow them to do is move on with their lives, and as time goes on, the impact will affect them less and less. It'll always be there, but at least they know what happened. They know who's responsible.

"It's a small force that managed to put these three in prison. They're murderers for life."