The parents of a teenager who was brutally murdered by a man obsessed with violent pornography in 2013 have said they are managing to rebuild their lives because they know that is what their daughter would want them to do.

Georgia Williams, who was 17, was killed in shocking fashion by Jamie Reynolds, whom she believed was a friend. Reynolds, whose romantic advances Georgia always rebuffed, was jailed for life after inviting her to his home in Shropshire under the pretence of working on his photography portfolio.

When she arrived, Reynolds filmed himself hanging her and then having sex with her dead body.

A police investigation discovered that Reynolds, who was 23 at the time, had been addicted to extreme ponography since he was 14. Officers discovered 16,800 images and 70 videos on his computer, as well as dozens of stories describing the fatal rape, torture and strangulation of women, including some featuring Georgia as the main character.

Georgia's father Steve, a detective with West Mercia police, told the new series of the CI programme Britain's Darkest Taboos that he had been "physically sick" when his colleagues came over to break news of his family's worst fears.

"There's no words. People use devastated and stuff like that. There isn't a word to describe it," Steve told interviewers.

Her mother Lynette told programme makers that the family is now trying to move on with their lives.

"I will not let Jamie Reynolds dictate to us still what we do in our lives," she said. "He's taken Georgia's life, he's taken ours to a degree. But I keep chipping away at the others to try and get them to get some of our lives back again."

Reynolds refused to admit to the murder or where he had dumped the body long after he was arrested, despite the fact that police had found grim photographs of her body on his camera. Eventually, following a Crimewatch appeal, Georgia's remains were found during a woodland search.

Reynolds eventually admitted her murder at Stafford Crown Court in December 2013. He was sentenced to whole-life prison sentence.