Joanna Yeates: Murder at Christmas

Exclusive documentary examining the shocking murder of Bristol landscape architect Joanna Yeates, who was strangled in her flat by Vincent Tabak in December 2010. Including interviews with Joanna's parents, initial suspect landlord Chris Jeffries, and those involved in solving the case. Never before had a missing pizza, grey sock and 293 tonnes of domestic rubbish played such an important part in a murder investigation. But this was all the police had to go on when 25-year-old landscape architect Joanna Yeates went missing on 17 December 2010.

Living above Joanna and Greg was their landlord Chris Jefferies. Described "as an eccentric pillar of society" he was a retired 65-year-old English teacher. Also a member of the local neighbourhood watch group, it was alleged that Jefferies had seen three people, including Joanna, leave her flat the night she disappeared. He would go on to play a key part in the hunt for the killer.

Joanna and Greg's next door neighbour was Vincent Tabak, a 33-year-old Dutch national. Described as an "introverted loner" as a child, he had grown up in Uden, Holland. After gaining his masters degree and later a PhD in engineering he moved to the UK. He worked in nearby Bath and lived with his girlfriend, Tanja Morson. The events on the night of 17 December would change his life forever. Joanna Yeates could not know she was living next to a human time-bomb ticking towards murder.

Vincent Tabak spent hundreds of hours trawling pornographic sites learning the best way to kill...and then he set about his task.In Joanna Yeates: Murder at Christmas we meet the people who lived through one of the most compelling crime stories of the decade.It emerged that Joanna's killer was an online fetishist who spent hours watching violent pornography. Psychologist Emma Scott outlines why some men are susceptible to online-addiction and gradually find the line between reality and fantasy blurred.

We also hear from former police detective, Mark Williams Thomas, on why his criticism of Avon and Somerset Police led to him being banned from media conferences. He explains the challenges that were faced by the Police as well as the mistakes that were made.

And we travel to Holland to hear from those who lived alongside Tabak; the man who broke a nation's heart and left a family forever without their 'ray of sunshine.'