Transcript for Too Real 'Fast and Furious': What Caused Paul Walker's Crash?
"night line". Paul walker was at the center of the $2 billion franchise that sent him on the fast track to fame. He lived vicariously through his daredevil stunts now hitting too close to home. We have the latest details on the charity event this weekend where things took a turn for the tragic. Reporter: Those blue eyes, that smile, that lead foot. For paul walker it was a recipe for hollywood success. He rose to fame in the fast and furious block busters, those street racing epics, six movies in all that earned urine vestal studios over $2 billion worldwide but now this is his hollywood ending. A fiery crash that killed the 40-year-old actor and his friend. The red porsche so mangled that it was unrecognizable. Calling into the question the fate of the latest movie that he was filming. Walker didn't just play a fast car junkie he was a self-described adrenaline junky off screen, too. And then a love of cars. Just under 200. I did 197. I haven't broken 200 yet. Are you going to try? I'll do it. It's the right car. Everything I have are cars that put out plenty of power but what limits you is aero. He is a member of a southern california racing team. That love of speed may have caused this. When rescue crews arrived, the fire ball was still burning. Two people dead. One of them is paul walker. Witnesses tried to put the fire out, too. One of walker's childhood friends reportedly attempted to pull his body from the burning car. Police had to hold him back. There is nothing. We tried. We went through fire extinguishers. Walker, the passenger and his friend the driver were proned debt at the scene. Police still do not know exactly what caused them to lose control. But authorities now say the car they were in was going very vast. This is something else authorities are looking into. The cause, one of the fastest cars out there. It sells for more than $400,000, goes from 0 to 125 in less than ten seconds and can reach 205 miles per hour. Even professional drivers call it scary to handle but these were professionals. Rodas had championship titles to his name. Does it surprise you knowing roger's skill level that this is the outcome? That's the answer that I came out here looking for is why? How? He's such a skillful driver. But you see this all the time. Jim spoke to both men just before they road off. They had all been attending a toy drive and car show for walker's charity to benefit the victims of the typhoon in the philippines. It was supposed to be a quick joyride. The crash happened just minutes after they left. This is one of the last known videos of walker right there with that porsche. I felt in my heart that something was wrong. What did you hear? I heard a big bang. Like something had hit something. And obviously it did. And right after I saw the smoke and I knew. What was the last thing you heard paul say? I'll be right back. That was the last thing that paul set. He looked at some of the guys and everything else. The coroner has not positively identified their bodies. They need the dental records first. Fast and furious catapulted walker to fame but he had a long road to stardom. He modelled as a child and later turning up on "who's the boss" and charles in charge. He told charlie gibson even he was surprised by his own success. Do you ever pinch yourself? Yeah, all the time. Why me. It's like winning the lottery. I keep winning it. This 2001 interview with the view seems haunting. To me driving fast, taking pride in your car that's what guys do. That's america. You know? Racing has always been around. It always will be. This movie shows that speed is fascinating and it's a rush and there is is a lot of risk and a lo of stake. There is a lot at stake with the last one, too. The fast and furious movies are the most successful franchise ever. They have to rethink the whole plans for not gist movie number 7 but seven, eight, and nine. There is is a real puzzle ahead of them. They have a much bigger investment than just the next movie. They're thinking about the franchise and the brand and big picture. It's been a while since i been behind the wheel in one of these. Walker was supposed to return to the set on monday. How was that one? He was half way through shooting the new movie. Universal is just scrambling trying to figure out what to do. They were totally caught off guard. Of course no one could have foreseen something like this happening. There is just no back up plan. Variety says that universal will need to chart a new course quickly. They have got other stars in the movies who have other commitments do you write around him? Do you cut him out of the movie? Do you fake it and shoot around what you have and get a body double to do things? These are questions they must be pounding their brain trying to figure out. Let's not blow this out of proportion. When heath ledger died in 2008, he was working on multiple films, "the dark knight" was nearly complete. It was possible to nip and tuck and get other actors to dub the lines in and really make it look like nothing had gone wrong. And earlier this year, james beg gandolfini died of a heart attack while on vacation in rome. Walker has another movie scheduled for release in two weeks. He plays a father trying to save his baby daughter during hurricane katrina. I got a baby that needs a rescue. In the real world he leaves behind a 15-year-old daughter and a grieving family. He lost a spirit. You lost a person that maybe is meant to be this way. All right? I'm devastated. The scene of the crash now a memorial spilling into the street. Fans of the movies and co-stars are showing up like model and actor tyrese gibson who left in tears. A real life twist that all too closely mirrors the movies paul walker made. Such a sad story.
This transcript has been automatically generated and may not be 100% accurate.