Last Updated Mar 3, 2014 3:03 AM EST
PRETORIA, South Africa -- Oscar Pistorius pleaded not guilty Monday to murdering his girlfriend on Valentine's Day last year, marking the start of the Olympian's murder trial.
The double-amputee athlete known as "Blade Runner" arrived in the courtroom at the high court in Pretoria wearing a dark gray suit and black tie, walking past the mother of the woman he shot and killed a year ago.
Pistorius is charged with murder with premeditation in the shooting death of girlfriend Reeva Steenkamp in the pre-dawn hours of Valentine's Day last year.
Pistorius pleaded not guilty to murder, two charges relating to discharge of firearm in a public place, and one charge of illegal possession of ammunition.
Pistorius says he shot Steenkamp by accident, thinking she was an intruder inside his bathroom, and the case could all hinge on that bathroom door.
Some experts not involved in the case say the double-amputee runner could still be vulnerable to a homicide conviction even if he is acquitted of murdering his girlfriend. That's because, they say, he violated the most basic tenets of gun-handling by shooting into a closed door without knowing -- at least, by his account -- who was behind it.
Monday's proceedings were delayed for an hour and a half while court officials scrambled to find an Afrikaans interpreter for the trial, which has been scheduled for half a year.
Defense lawyer Kenny Oldwadge laid out Pistorius' legal strategy, reading a statement from the runner in which he says the killing was an accident and that there were inconsistencies in the state's case, as well as an attempt to introduce inadmissible character evidence to discredit him.
In the statement, Pistorius said he brought two fans in from the balcony on the night of the killing, after speaking to his girlfriend who was in bed beside him. He said Steenkamp must have gone into the bathroom while he was fetching the fans. Pistorius said he did not notice that she had gone and heard the bathroom window open.
"I approached the bathroom, armed with my firearm, so as to defend Reeva and I," Pistorius said in the statement that was read by his lawyer.
He said he then heard a noise in the toilet, and was in a "fearful state" because he was unable to run away or defend himself physically since he was not wearing his prostheses.
"The state has embarked on a strategy to rely on unsubstantiated allegations," he said, citing a neighbor's testimony that an argument had been heard in his home.
According to Pistorius' statement, other neighbors living nearby said they had not heard any argument.
He also cited evidence provided by police detective Hilton Botha as "false in material respects."
"The scene was contaminated, disturbed and tampered with," the defense statement said. "This feature of the state's case will be dealt with when Botha, among others, gives evidence."
In the courtroom, Pistorius, wearing a dark gray suit and black tie, was seated near Steenkamp's mother, June. She was quoted in the Pretoria News, which published an interview she gave to a British newspaper, saying that she wants to see Pistorius.
"I want to look at Oscar, really look him in the eyes, and see for myself the truth about what he did to Reeva," said June Steenkamp, 67. "Whatever the court decides at the end of his trial, I will be ready to forgive him ... But first I want to force him to look at me, Reeva's mother, and see the pain and anguish he has inflicted on me. I feel I need that."
Reeva Steenkamp was a glamorous model and budding reality TV show star when she was cut down at age 29.
South Africa's criminal justice system and gun culture will be under a global spotlight during the Pistorius trial, which has some parallels with the O.J. Simpson case in the United States 20 years ago because of the celebrity factor, the sensational allegations and the fascination of people around the world. Parts of the trial will be broadcast live on television, adding to the scrutiny. Simpson's trial for the killing of his ex-wife and a man was televised in its entirety.
But in one glaring difference, Pistorius acknowledges he killed the victim. The Olympian says he thought Steenkamp was a nighttime intruder in his home in the early hours of Feb. 14 last year; the prosecution maintains he intentionally shot her several times in the bathroom after an argument.
"They don't have to prove that this glove belongs to O.J. Simpson because it fits his hand," said Marius du Toit, a former prosecutor, magistrate and now criminal defense lawyer. "We know there's only one person who caused Reeva's death."
Du Toit was referring to the leather glove that was found at the scene where Simpson's ex-wife and a man were killed in 1994. The glove seemed too tight when Simpson tried it on in court, prompting a defense lawyer to say: "If it doesn't fit, you must acquit." Simpson was acquitted by a jury.
But prosecutors in the Pistorius case have an edge, said du Toit: "Any person that has admitted to killing another person in circumstances when your actions are unlawful will face a steep hurdle in getting off scot-free."
South Africa has stringent laws regulating the use of lethal force for self-protection. In order to get a permit to own a firearm, applicants must not only know those rules but must demonstrate proficiency with the weapon and knowledge of its safe handling, making it far tougher to legally own a gun in South Africa than many other countries where a mere background check suffices.
Pistorius took such a competency test for his 9 mm pistol and passed it, according to the South African Police Service's National Firearms Center. He therefore should have known that firing through a closed door cannot be viewed in South African law as an accident, according to Andre Pretorius, president of the Professional Firearm Trainers Council, a regulatory body for South African firearms instructors.
Criminal law experts believe that if the prosecution fails to prove premeditated murder, firing several shots through a closed door could bring a conviction for the lesser charge of culpable homicide, a South African equivalent of manslaughter covering unintentional deaths through negligence.
Sentences in such cases range from fines to prison. They are left to courts to determine and are not set by fixed guidelines.
Another key piece of evidence will be the blood spatter analysis on the inside of the toilet cubicle, according to J.C. de Klerk, a ballistics expert who used to work for the South African police. He said it could give an indication of Steenkamp's position when she was shot, including whether she was sitting on the toilet, or hiding behind the door as prosecutors likely suspect.
The "back spatter and front spatter" could also indicate the sequence of shots as they hit Steenkamp and whether there were exit wounds, de Klerk said. But such hard data and other factors, such as the trajectory of the bullets when they were fired, cannot support Pistorius' argument that he was responding to what he thought was an imminent threat.
"It's only him," de Klerk said. "We're only going to rely on what he actually says. There's no scientific evidence that's going to prove that his life was in danger."
Other key evidence could emerge from the mobile phones of Steenkamp and Pistorius that were found in his house. South African prosecutors have sought help from Apple officials to access the locked iPhone of Pistorius, who said he forgot the password.
Parts of Oscar Pistorius' murder trial can be broadcast live on television by three remote-controlled cameras in court, but testimony given by Pistorius cannot be shown. Judge Dunstan Mlambo, who made the decision to allow broadcasting, said he had weighed up arguments for a fair trial from the Pistorius camp with principles of open justice and freedom of expression.
Mlambo showed "an awareness of the competing considerations at play," said Justice Edwin Cameron of South Africa's Constitutional Court. He declined to comment directly on the ruling, but said he favored cameras in appellate courts.
"We haven't yet done it here" at the Constitutional Court, Cameron said in an interview Friday with The Associated Press. "But my colleagues have agreed to think about it and we're in the process of exploring ways of doing it."
Trial judge Thokozile Masipa, who will decide the verdict in the Pistorius case, will be assisted by two assessors. Cameron described such individuals as "often highly experienced people, often retired regional court magistrates who have dealt their whole professional lives with criminal cases, and are very astute in assessing probabilities, in judging credibility of witnesses and in applying the criminal procedure act."
South Africa abolished the jury system in 1969 following arguments that whites-only juries during apartheid would be unlikely to deliver fair verdicts involving, for example, a white perpetrator and a black victim.
"It was a system riddled with racism, as it was in the American South," Cameron said.
Race is unlikely to be a factor in the Pistorius trial in post-apartheid South Africa, say experts, who suggest the case is likely to focus on the forensic evidence surrounding the toilet door, data from cell phones and on the character of the defendant.