Runner. His lawyers are going to present a very novel legal argument. Heartstopping new pictures of the crime scene, and a new examination of the evidence. Bullet holes, smartphones, clothes in the bedroom. Will it add up to a smoking gun . Or will it clear this olympic icon . Exclusive new information on both sides. The prosecution what everybody will be watching for is whether or not you can prove he intended to kill her. The witnesses. This doesnt feel like its really happening. The trial the whole world will be watching. You want to believe him. You really, really, really, really want to believe him. Im lester holt and this is dateline. Tonight Keith Morrison with Oscar Pistorius, the race of his life. Four shots at close range from a 9millimeter pistol of the the bullets blew through the door like it was paper. Behind that flimsy barrier, the beautiful celebrity, lawyer and model, Reeva Steenkamp, shot dead by her olympian boyfriend, Oscar Pistorius. Its a tragic tale, almost shakespearian and frankly tainted with myths, embellishments and contradictions. The story you only think you know. Here in south africas capital city, pretoria, hordes of media are assembling to watch the murder trial of the most famous disabled athlete in history. Tonight youll hear in an exclusive interview the states case against Oscar Pistorius, a case kept secret for months. He knew that reeva was in the bathroom and he intended to kill her. And about the remarkable strategy the defense is going to use to fight back. Very novel predent setting legal argument. The events began just before 6 00 on valentines eve, february 13th, 2013. Here on the surveillance camera, you can see a smiling Reeva Steenkamp driving her silver mini past security guards standing watch over oscars walled and debated subdivision. Reeva was followed ten minutes later by oscar, driving a white bmw. By 10 00 p. M. , oscar will claim, he had removed his prosthetic legs and was in bed watching tv while she practiced yoga on the floor nearby. This crime scene photo, not intended for public consumption but leaked to the media reveals a never to be opened Valentines Gift from reeva to oscar, ossie as she liked to call him. It wasnt much later, according to oscar, they were both fast asleep. And then 3 00 a. M. , this. More leaked photos show where four bullets blew through the bathroom door, two bullet holes marked by police appear to be about waist high. One of the bullets ended up in the base. After firing the pistol oscar bashed an opening in the door with a cricket bat. And then oscar carried reevas body down these stairs and into the living room. Mr. Pistorius himself used his firearm to kill Reeva Steenkamp and thats a fact that cannot be disputed. Reporter attorney nathi mcnube spoke to dateline. Who did he phone to tell him please come help . Was it the police . Well, we know for sure that it was not the police. I dont think its in dispute that he phoned his friends. His friends were the first on the scene and then the police after. The lead detective got to the house, saw reeva was dead, had been hit three times, in the hip, right elbow, above her right ear. In the bathroom he found two iphones. As youll see, those might become key evidence at the trial. He listened as oscar said he thought he was firing at a burglar. He didnt buy it and oscar was charged with murder. Double amputee olympic runner Oscar Pistorius was charged overnight with the valentines day murder of his girlfriend. It was, simply, shocking. Oscar pistorius was admired around the world, of course, but in south africa he was a whitehot celebrity. The blade runner, a double amputee who set records and fought for the right to compete in the 2012 olympic games. Karen maughan of enca has covered this story from the start. Journalist. Im a South African actually. This is a very conflicted narrative because you want to believe him. You really, really, really, really want to believe him. In the days after the shooting, many South Africans did believe oscar. Many, in fact, still do. The support has been overwhelming from all across the world. Pete van zill, oscars hrg, spoke to us two weeks after the shooting. Its not just support for oscar, its support for him having lost someone really dear and close to him and its been overwhelming. Could it be that oscar in a panic and fearing for his life fired blindly into the door, that it was all a terrible accident . With the trial coming up, both sides will claim they know the truth about that night. Not just what happened, but why. He killed her, they have no doubt of the fact that he killed her. But what was his intention . The truth, as weve discovered, its more complicated than you may have been led to believe. Still to come, an inside look at both sides. Can prosecutors show this was a coldblooded killing . We would not have charged him if we didnt believe so. Can the defense show that it wasnt . Oscars bold groundbreaking strategy. This is a person in a state of fear and you need to judge him by that standard. Before using her new bank of america cred card, which rewards her for responsibly managing her card balance. Before receiving 25 toward her balance each quarter for making more than her minimum payment on time each month. Tracey got the bankamericard better balance rewards credit card, which fits nicely with Everything Else in life she has to balance. Thats the benefit of responsibility. Apply online or visit a bank of america near you. Scrubbing bubbles, we have toilet duty at the local fire station 20 guys use this toilet. Lets bubble our toilet gel works with every flush monday shift . Clean sunday shift . Still clean nice job, guys we work hard so you dont have to do you really think brushing is enough to keep it clean . While brushing misses germs in 75 of your mouth, listerine® cleans virtually your entire mouth. So take your oral health to a whole new level. Listerin®. Power to your mouth™. And went off. When dateline continues. [ male announcer ] build anything with the new toyota tundra. Toyota. Lets go places. [ male announcer ] the rhythm of life. [ whistle blowing ] where do you hear that beat . Campbells healthy request soup lets you hear it in your heart. [ basketball bouncing ] heart healthy. [ mm. ] great taste. [ tapping ] sounds good. Campbells healthy request. Mm mm good. ® crunch thats serious heat hitting your tastebuds. What . Five wings for 3 . Thats spice and price. Better get yours quick. Theres something for everyone to love at mcdonalds. Ba da ba ba ba producer of the reality show clifton shores. Oscar allegedly accused quinton of having an affair with samantha taylor, during the olympics, that is after oscar first broke it off with samantha. Oscar walked up to him and started going off at him. Dude [ bleep ] my girlfriend while im running for my country. Soccer star Marc Batchelor will testify for the prosecution at oscars trial. He told us in an exclusive interview that his friend, quinton van der burgh, who, by the way, denied dating oscars girlfriend, was so upset about oscars outburst he asked batclor to speak to oscar, get things sorted out. He was still shaken up and asked me to find out what was going on. When they spoke on the phone, said batchelor, oscar was com t combati combative. He said whats the problem. Youve got a problem with me . Im not scared of you. I said youre a bit out of your attempted homicide for firing his own pistol into a minivan full of passengers the Previous Year during a police pursuit. Within a week, bota was off the case. I actually think that him being removed was the best case best thing for the case . The best thing that could have ever happened. Because, said karyn maughan, police were able to put one of the top detectives in the country on the case. Hes brilliant. Hes really one of south africas best police officers. I think the state has put a huge amount of work and a huge amount of money and a huge amount of efforts into making their case. A case that the prosecution argues is just as simple as it looked on day one. You cant deny that reeva was killed by himself at his house and that four shots were fired at her. Attorney nathi mcnube in an exclusive interview with oscars trial, though, will be seen not just in south africa, but across the world. And the global audience that once watched him make history in the olympics will now, come monday, be watching an altogether different event. Because south africa doesnt have a jury system, oscar will only have to persuade a judge that he is an innocent man, that his story is true. But that judge will not be swayed by an emotional story, only by facts. And that judge, seen here in a documentary courting justice, is a former reporter and social worker known for her tough sentences, especially when it comes to crimes against women. But of course the legal burden of proof lies with the prosecutors. Theyre the ones who must convince the judge beyond a reasonable doubt that reevas death was no accident. But if they fail to do that, and oscar is allowed to go free, what then