Studio Universal Pictures quickly put production on hiatus, but the film picked back up when Caleb and Cody stepped in to finish it, their bodies used in place of Walker's with his face digitally superimposed over theirs.
Despite the emotional closing scene featured in Furious 7, which hinted at Walker's death, Brian O'Conner is very much alive in the franchise and was mentioned twice in last year's The Fate of the Furious - a film that actually nearly included a CGI Walker.
Paul Walker's brothers say they are open to playing the late actor again in the Fast & Furious franchise. The two previously had to stand in for their oldest sibling after he died in a tragic off-set vehicle accident while "Furious 7" was still in production.
Do you think Paul Walker's character should be brought back before the Fast and Furious film series concludes? 'That's my dream and I hope we get to do that in one of the future movies'.
"I think there could potentially be a way to do it", he said.
More recently, the two shared with the AP that they'd be interested in reprising the role, with Cody Walker adding the stipulation that it would have to "take a lot of thought" and "be tasteful". "It would have to be tasteful", Cody Walker, 30, said in the interview.
The brothers have been on the promotional trail for a Paramount Network documentary about the beloved star titled I Am Paul Walker. "And in his absence, I think it's lost its way in a big way".
'I think one day, when our kids are little older and we are able to share that experience with them and be like, "Hey look, this is your uncle Paul".