20-year anniversary of the murder of TV presenter Jill Dando approaching, her killer remains at large.
On the morning of April 26, 1999 when 37-year-old Crimewatch leading left his father's house in Chiswick, and returned to his home in Fulham.
When she arrived shortly after 11:30 she grabbed from behind and shot in the head.
BBC Breakfast News presenter was found 14 minutes and pronounced dead upon arrival at the Charing Cross Hospital.
Last week, the former Met detective chief superintendent Hamish Campbell admitted that the secret is unlikely ever to be resolved, with his doomed probe in a crime that leads to a conviction, which was overturned in 2008.
Gunshot residue found on the coat of Barry George will prove unacceptable as evidence in the seven years after he was imprisoned for a crime.
He was released in 2008, renewing interest in the case, which continues to confuse investigators two decades.
"We, as the investigation team brought to someone in the court, and that's what we had to do," said Mr. Campbell in BBC One documentary "Murder Jill Dando", which airs on Tuesday.
"The outcome is completely out of our hands. You're either guilty or you are not to blame. It does not actually define what you mean by innocence ".
Responding to a question, when he thought that someone would return to the court on the issue, he said: "Probably not."
Mr. Campbell also discounted the idea that the new man will be brought to justice.
He added: "There has always been the opinion, in the media and elsewhere, that the police chose Barry George somehow as a scapegoat, and for lack of a better word, to Patsy for the investigative team, because we could not decide.
"It is somewhat insulting and totally untrue and wrong. If none of the things [about Barry] with & # 39 appeared, he would never have been charged at all. "
With interest in the case is growing once again, we look at six theories about who was behind her death.
One of the first theories to gain traction focus on job, presenting Crimewatch Dando in.
Some believe that its prominent role on the show, which led to countless criminals who end up behind bars has made her a target.
In 2017 ITV program, poured fuel on the fire of the conspiratorial, when an anonymous killer said investigative journalist Mark Williams-Thomas, that he knows who the killer is, failure to give a name for fear of retribution.
Character assassination sheds doubt on the theory of man hit however.
The fact that the killer left sleeve at the scene – which was visible place is not an easy escape route – and not to use the silencer does not scream professional assassin.
Some of them argued that Dando really make enemies in the wrong circles ..
According to an anonymous source, who spoke years after the murder, Dando VIP tries to expose a pedophile the BBC.
If the corporation bosses got wind that she was sniffing around, they decided to take action, the theory goes.
A source said: "I do not remember the names of all the stars at the moment and I do not want to accuse anyone, but Gill said they were surprisingly big names.
"I think she was quite shocked to learn about the drawings of children, and that information on how to join this terrible pedophile were freely available.
"Jill said others have complained to her about sexual matters, and that some female colleagues have also claimed that they had been groped or attacked.
"Nothing has been done, and it seemed that the policy turn a blind eye."
He told the BBC that there was no evidence to support these claims.
Dando at the center of attention and a large following led police to a question from the & # 39; is a member of her fans had been responsible for her death.
About 140 people who have been "obsessed" with the star have been identified by the police, including those who sent her sexually open letters to fans.
Shortly before her death, engagement Dando to obstetrician Alan Farthing was published, which led to the hypothesis that Var & # 39; Yat supporter could have pushed over the edge.
This theory has been largely discounted, if not found, none of the 140 or any of the ex-boyfriends Dando, to be at Fulham in the day.
In just a few months before his death Dando NATO forces were the bombing of Serbia in the framework of the Kosovo war.
Three days before the murder of a British bomber was hit Radio Television of Serbia and scored 16 staff members.
People with Eastern European accent called BBC HQ the day after Dando's death in backup suspicion that it was the scene of the murder.
His warning that BBC News executive director Tony Hall was next on the list WSSD & # 39 were adopted; tackle.
In the year 2012 the Reverend Branco, the widow of a prominent Serbian journalist Slavko Curuvija called, Dando said, was targeted because it presented an appeal calling for support for Albanian Kosovars.
Her husband was shot dead outside his home in Belgrade, 15 days before the Dando murder that led Prpa believe there was a link.
The theory has been challenged by the editor of the International Affairs BBC, John Simpson, who maintained a tenuous link Dando on the conflict is unlikely to select it.
He offered his work covering the NATO bombing of Belgrade made it much more obvious target.
Joe the bartender
Another theory is further motivation for the killer Crimewatch work in Dando.
In 1996, Kenneth Noye was sentenced to life imprisonment for the murder of wrath 1996 road via Crimewatch appeal.
According to a report from the now-defunct National Criminal Intelligence Service, a bartender named Joe Noyé owed money and may have decided to settle their debts by targeting Dando.
The report said: "Joe has a bar in Tenerife, visited the leading emigrant criminals. He described how the gangster has proved disappointing owed money Kenny Noyé. There's also been talk of Joe was taken to restore its reputation with creditors bandit ".
It does not seem that Joe never traced.
A final theory again asserts that Dando was aimed at her Crimewatch work, but this time the creation of made to track down the killer.
Wayne Aird, who is serving a life sentence in prison for killing a man, two months after Dando was shot dead, reportedly admitted that part of what he said was "establishment cover-up."
He argued that the IRA was responsible for the death of Dando, but has not been brought to justice for the murder out of fear that it could jeopardize the peace process in Northern Ireland.
- The murder of Jill Dando on BBC One at 9:00 pm Tuesday, April 2nd.