Diesel posted the image on his Facebook page, where he shared an anecdote about his reaction when he first learned of Walker's death last November in a car crash. Diesel wrote that he raced to Walker's parents' house, and shared in a special moment with Walker's father, fostering a strong bond with the family.
"After spending time with [Walker's] biological brothers, I must say to the parents, you raised some great kids," Diesel wrote Monday.
The photo shows Diesel, with his back to the camera, talking with Caleb (left) and Cody (right) Walker during a recent day of shooting. According to Universal, the men will "complete some remaining action for their brother and fill in small gaps left in production," and CGI will be used to mask any noticeable differences between the brothers' physiques.
"Fast and Furious 7," directed by James Wan, is due out on April 10, 2015.
Article photo by Kevin Winter/Getty Images for NAACP Image Awards