Diesel took to Facebook on Sunday and shared a photo from the last scene he shot with Walker.
"There was a unique sense of completion, of pride we shared in the film we were now completing," Diesel wrote.
After Walker's tragic death earlier this month, fans of the "Fast" franchise questioned the state of the upcoming film, "Fast and Furious 7."
Diesel confirmed that Universal Pictures will push back the movie's original release date from July 11, 2014 to April 10, 2015.
"Fast 7" was still filming at the time of Walker's death. It's still unclear how the studio will complete his final scenes.