In broad daylight on a busy Woolwich street on 22nd May 2013, serving soldier Fusilier Lee Rigby was attacked and murdered by Islamic extremists Michael Adebolajo and Michael Adebowale. The men used their car to strike the soldier from behind as he crossed the road. They then proceeded to use knives to hack at Lee’s body in an attempt to decapitate him before dumping him in the middle of the road. These sickening events were caught on camera phones by horrified onlookers and the killers were filmed claiming to have carried out the attack in the name of Allah. In a dramatic sequence of events, police arrived at the scene within minutes and shot at the two men as they ran towards them holding up their weapons. Both Michael Adebolajo and Michael Adebowale were found guilty of murder at the Old Bailey. In this programme we speak to witnesses to the attack and experts on terrorism to examine how two young British men could be radicalized to such an extent that they killed an innocent man in the name of religion.

One of the UK’s biggest sex trafficking rings was uncovered in Rochdale in 2012. In a horrific catalogue of abuse, girls as young as 13 were subjected to rape and torture by a gang of nine men. One 15-year-old girl was even ‘recruited’ by the gang to lure other girls into the trap. After plying them with alcohol and money, the victims would be raped by up to twenty men at a time. The gang were sentenced to between four and nineteen years for their crimes.

With exclusive, first time access to Dennehy’s mother and father, we hear from the murderer’s parents and how the crimes of their daughter have shattered a family. Joanne Dennehy is the first woman in the UK to be handed a whole life tariff by a Judge. The judge ordered that she should die behind bars for the brutal murders of three innocent men. Dennehy showed no remorse for the killings. Her reason – “to see if I was as cold as I thought I was. Then it got moreish and I got a taste for it". In this episode we delve into the mind of such a cold hearted killer and look at what drove her to become one of Britain’s most notorious female criminals. We also hear from the officers who handled the case and an acquaintance of Dennehy’s who she bragged to.

Police and witnesses reflect on David Copeland's nail bomb terror in 1999, when blasts in Soho, Brixton and Brick Lane killed three and injured over one hundred.

Gripping documentary examining the fatal stabbing of 22-year-old motorist Stephen Cameron during an altercation on the M25 in 1996.

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The horrific murder of Lin and Megan Russell in 1996 made headline news worldwide. Lin and her two daughters, Megan and Josie, were bludgeoned whilst walking down a country lane after a swimming lesson. Remarkably Rosie survived. Michael Stone was convicted of their murders in 1998. In this episode Shaun Russell, Lin’s husband, reveals his tragic story. How he heard the dreadful news, what happened on the day of the tragedy and the aftermath. We also speak with police and family friends about the case and reconstruct the family's tragic journey on that day.

In 1985, PC Keith Blakelock was brutally murdered during a riot on a housing estate in North London triggered after a black woman died of heart failure during a house search. Keith received more than 40 injuries during the sustained attack from a number of rioters. Nobody has been brought to justice for his murder to this date, despite three investigations and the arrests of over three hundred people.

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Rolf Harris was considered one of the country’s best loved entertainers until he was accused of a string of historic indecent assaults. Unlike Jimmy Savile, he was still alive to be brought to justice. Originally from Australia, Rolf Harris became a television star in the UK back in the 1960’s. He would become famous for his TV programmes, music and art, even painting a portrait of the Queen for her jubilee in 2012. But in August 2013, his legacy and reputation lay in tatters when he was accused of numerous indecent assaults on girls as young as eight years old between 1968 and 1986. In July 2014 he was sentenced to five years in prison for his actions. We reveal Harris’ life and his crimes told by people who worked with him and those who represent his victims who fought so long for justice.

The hunt for five year old April Jones, when she vanished in October 2012, was the largest missing person search in UK police history. April went missing whilst playing with her friends and was last seen getting into vehicle near her home in Machynlleth, mid-Wales. The nation held their breath as the hours, days and weeks rolled on, in the desperate hope to find her alive. But on the 6th October a local man, Mark Bridger was charged with her abduction and murder. Investigations in his background revealed that Bridger was a prolific user of child pornography and a paedophile. After a long and distressing trial, Bridger was found guilty and sentenced to life in prison with a whole life tariff. With unprecedented access to the Jones family and the police investigation, we reveal the true story behind this appalling crime and how April’s family have channeled their grief into campaigning for a safer internet.

The Hungerford massacre shocked the nation in 1987 when the heavily armed Michael Ryan, 27, took to the streets and began firing at anyone in his path. By the end of the afternoon, the horrific massacre was finally over. Ryan had killed 16 people, including his mother, wounded 15 others and seriously transformed the lives of everyone who was unlucky enough to be there that day. The tragedy is told through the eyes of the people at the core of the killings; a survivor, heroes who tried to save lives, police and a nurse at the hospital.

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Drug dealer Dale Cregan hit the headlines in 2012 when he murdered police officers Nicola Hughes and Fiona Bone. Dermot Murnaghan examines the tragic case

Beverley Allitt was thought to be a 'model' nurse.

The parents of innocent 11-year-old Rhys Jones, shot on his way home from football club in Liverpool 2007, speak about the harrowing day when they lost their son.

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On an October evening in 1977, 2 girls were enjoying a night out in the World’s End pub in central Edinburgh. The following day, one body was found on a beach, the other in a field. The girls were seen leaving the pub with two men but the identity of the killer would remain a mystery for the next 30 years. In 2007, Angus Sinclair was charged with the girl’s murder after new DNA evidence linked Sinclair and his brother in law Gordon to the murders. However the trial sensationally collapsed when a piece of crucial evidence was withdrawn. Unbeknownst to the jury, Hamilton had a history of sex attacks starting at the age of 16 and culminating him serving a life sentence for the murder of a 17 year old woman in Glasgow in 1978. In 2014, following the development of new DNA technology, Prosecutors successfully applied for a change in a century’s old law of double jeopardy, consequently allowing the same man to be tried twice for the same crime. This time, the trial proved successful and Sinclair was jailed for a minimum of 37 years. He has been described as Scotland’s worst serial killer and the authorities believe he may well have been responsible for numerous other murders.

Estate agent, Suzy Lamplugh, disappeared in July 1986 after going to meet a client at a house in Fulham. Witnesses said they saw her arguing with a man near the address and then getting into a car. She has never been seen since. For almost thirty years police have followed many lines of enquiry – one being to identify who ‘Mr Kipper’ is that she went to meet. So far they have reached a dead end. In 1994 she was officially declared dead, presumed murdered. The strongest theory to date is that convicted rapist and killer, John Cannan, killed Lamplugh. But as yet, this hasn’t been proven. Cannan is already serving a life sentence with the recommendation he never be released.

Investigation into Jeremy Bamber's brutal murder of his family in Essex in 1985. Sentenced for life, he still maintains he is innocent.

General Practitioner Harold Shipman was convicted of killing 15 patients in 2000. An official report after his sentencing took that figure to 215. He was sentenced to life in prison and committed suicide in his cell 2004. This exclusive documentary lifts the lid on the shocking discoveries made by his colleagues in early 1998; how police were alerted but the killer was left to murder three more women before finally being arrested in September 1998.

Myra Hindley and Ian Brady were convicted of murdering five young boys and girls between 1963 and 1965. Until 1985 both killers maintained their innocence, but eventually confessed and led police to all but one of the bodies – Keith Bennett, who remains missing until this day. We investigate the brutal murders through relatives and officers, and look into new information held by Bennett’s brother that could finally reveal his resting place.

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For the first time since the terror attack in May 2017, we hear from the survivors, victims' families and emergency responders about that tragic night.