(AEDT), Oscar Pistorius faces trial for the murder of his girlfriend Reeva Steenkamp. Africa correspondent Martin Cuddihy explores the intrigue behind the high-profile case.
The modern legal system includes a set of guiding principles to ensure everyone is given a fair trial.
One of these is the notion that someone is innocent until proven guilty. Herein lies some of the intrigue in the Oscar Pistorius trial.
We already know he is guilty – to a degree. His trial starts Monday evening and what is not being disputed is the fact that the man known as the Blade Runner shot and killed his girlfriend, model Reeva Steenkamp.
It was in the middle of the night on Valentine's Day last year when Pistorius was woken by a noise.
Living in one of the more dangerous cities in the world, it is not surprising he had a pistol at home.
He heard noises in the bathroom and thought there was an intruder.
He got out of bed and fired through the door a number of times. Ms Steenkamp was inside. She died at the hands of a man who was supposed to love her.
Even before that night Pistorius was a household name.
He was the first disabled athlete to compete at the Olympic Games. He was one of 'the' stories of the London 2012 Games.
He was born in South Africa in 1986 with a condition that meant the fibula bones in his lower legs were missing. Both legs were amputated below the knee when he was 11 months old.
His success as an athlete is still an inspiration to many.
Pistorius holds a number of world records and paved the way for disabled athletes entering into able-bodied competition, even winning a medal at the World Track Championships in 2011.
A huge number of people are intrigued and fascinated, and revel in the story of this fallen hero.
This trial has generated so much interest in Africa that there is now a 24-hour channel dedicated solely to the Pistorius trial.
As well as broadcasting parts of the case, it will show documentaries and interviews 24 hours a day for the next three weeks.
A huge media contingent has applied for limited spaces inside the Pretoria courtroom.
According to leaked documents, the prosecution is expected to rely on 13 facts to prove Pistorius did intend to kill Ms Steenkamp.
This will include witnesses telling the court they heard arguing, fighting and even screaming before shots were fired.
It will also rely on the fact the model had her phone in the bathroom with her and she had locked the door.
By his own admission, Pistorius did not try to determine who was behind it before opening fire.
He has hired a crack team of legal experts from Cleveland in the United States.
These forensic specialists are experts at recreating crime scenes and will no doubt try to demonstrate the Paralympian was scared for his life when he fired his gun.
The former athlete insists this was an accident. He is not disputing the fact he killed his girlfriend.
So this trial will not focus on the "who", so much as the "why". The trial will try to establish what was going on in the mind of Pistorius when he pulled the trigger.
Was he in a rage and intending to kill her, or did genuinely think there was an intruder in the locked bathroom?
This trial will reach a verdict after a few weeks. That verdict will be based on the legal notion of "beyond reasonable doubt".
Evidence will be presented that both condemns and exonerates Oscar Leonard Pistorius.
The judge will decide his motivation and then his fate. A stranger will tell him what he was thinking.
But the limitations of the law mean that only ever the accused can truly know what he meant to do.