A hard-hitting film about a former Royal Marine who was murdered overseas seven years ago has been sent to the Prime Minister.

The nine-minute recording focuses on the case of Carl Davies, from Sittingbourne, whose body was found on the south Indian Ocean island of Reunion in November 2011.

The video, produced by Standby Productions, features Carl’s sister, Kerrie Stewart, and shows the true impact the 33-year-old’s murder has had on his family.

Narrated by Jordan Wylie, an ambassador for the Justice for Carl Davies campaign, it also asks viewers to sign a petition for the UK government to raise the case with the French authorities.

The petition was created in January following the release of Vincent Madouré, who was found guilty of Carl’s murder.

He was convicted after a three-day trial in the island’s capital Saint-Denis in June last year, but it later emerged he had been released on October 24 under judicial supervision after his appeal for a retrial was successful.

In the video, Mrs Stewart explains how she felt when she was told her “best friend and absolute hero” - a former worker at later at the Isle of Sheppey Academy - had died.

"I remember dropping the phone and I ran out of my house," she said.

"I didn't know where I was going or what I was doing, and I remember sitting in my neighbour's garden and I just thought, what is that noise?

"It was me, I was like a wounded animal screaming, and in the process of screaming I had torn chunks of my hair out of my head to try and get the words 'he's dead' out of my ears."

The emotional video was sent to Theresa May and foreign secretary Boris Johnson in an attempt to ensure justice for Carl - who used to work at the Isle of Sheppey Academy.

Mrs Stewart said: “It has also been uploaded to Youtube, Facebook, Twitter, Linkedin, and we’ve had a few celebrities share it too including Ant Middleton, who is probably best-known for being chief instructor on Channel 4's SAS: Who Dares Wins, and actor John Bowe, who plays Lawrence White in Emmerdale.

“The purpose of the film is to say to the British public, please sign the petition, let’s get Carl's story heard in parliament – we will not be ignored anymore.

“Carl wasn’t just an individual, he was someone who loved his life and it was so cruelly taken away from him.”

The 37-year-old added: “We need 100,000 signatures by July to allow our voice to be heard in parliament.

“The British government needs to stand up for Carl, someone who has served their country but is being ignored. It needs to put pressure on the French authorities to make sure there is a retrial and that there is finally justice for Carl.”

The family, who were from Harrietsham, now live in Scotland.

The petition has so far reached more than 7,200 signatures. If it gets to 10,000 the government will respond and at 100,000 it will be considered for debate in Parliament.

• If you'd like to sign it click here.