When actor Paul Walker was killed in a car accident halfway through shooting the seventh 'Fast & Furious' movie, director James Wan made the difficult decision to finish the film, completing Walker's performance using both stand-ins and digital effects created from existing footage.

Paul Walker and the team of 'Furious 7'
Paul Walker and the team of 'Furious 7'

To make the scenes look seamless, Wan hired Peter Jackson's Weta Digital to use blend the various elements into the completed film. And in a nice touch, he got Paul's brothers Cody and Caleb to perform as body doubles in the remaining sequences.

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"It's an experience that I was very hesitant to commit to," Cody said, "but I'm really glad I did. I met a ton of really amazing people and made several life-long friendships. It was an absolute rollercoaster throughout the entire process - lots of tears, lots of laughs."

Watch The Trailer For 'Furious 7' Here:

To complete Paul's scenes, Cody and Caleb relied on each other for support. Cody said that working together "brought us closer than ever at a time where we both really needed it. That is probably the single most important part of making this movie."

The same technology was used to complete Oliver Reed's unfinished scenes when he died during the filming of 'Gladiator'. And it was also used to double Armie Hammer in 'The Social Network', placing his head on a stand-in actor's body. But the process has advanced significantly, and audiences for 'Furious 7' will be hard-pressed to know which scenes were completed before Walker's untimely death.

More: 'Furious 7' Is A Fitting Goodbye to Paul Walker

Most important to the cast and crew is that the film's final scenes now play out as a homage to Walker's work in the franchise, sending off his character with an emotional kick that's bound to elicit a few tears from his fans.