BBC reporter Raphael Rowe carried out the investigation for Panorama and describes why he undertook it.
There are always at least two sides to a story. As an investigative journalist you have to listen to both.
But sometimes there are more than just the two sides. Which one do you believe?
Is it the way the story is told that convinces you or the person telling it? What's the motive of the person telling the story or giving information?
How reliable is that person? Can what they say be corroborated?
If not, does that make the story unreliable? Is there independent evidence to support what you've been told?
These are just some of the sorts of questions a jury would consider in a criminal trial.
They are also the questions I asked myself as I investigated the murder of Jill Dando and the conviction of Barry George who's serving a life sentence for her murder.
Two years ago the Criminal Cases Review Commission decided to review the case.
I was wrongly convicted of a crime. I spent 12 years in prison before my conviction was quashed by the appeal court and I became a BBC reporter.
I have a unique insight and understanding of the complexity of investigating such a case.
That's not to say you come at the story from a particular point of view but you simply use your wit and understanding to get at the facts and evidence to understand where the truth lies.
I didn't follow the case with any interest at the time so when I started to ask news colleagues and others what they could remember from the time it was interesting to learn that many didn't think the evidence was strong enough to say he was guilty.
That's not the same as saying he didn't do it.
That being the case I wondered why no one within the BBC had already investigated the issues that raised questions about the safety of the conviction.
Other channels and print journalist had for years. Jill Dando was a much loved colleague of many within the BBC and a popular presenter on BBC One.
I was aware it was a sensitive subject and approached it cautiously.
But if Barry George is a victim of a miscarriage of justice then in a way so is Jill Dando.
The new evidence discovered during our investigation raises serious questions and highlights important areas that need to be investigated beyond our capabilities.
Jill Dando's Murder: The New Evidence will be broadcast on Tuesday 5 September at 2100 on BBC One and streamed live at bbc.co.uk/panorama.