Kevin Winter/Getty Vin Diesel and Paul Walker in March 2009
"Nine years… love you and miss you," Diesel, 55, posted alongside the photo.
Walker died on Nov. 30, 2013, in a car crash. He was 40. As he was in the middle of filming Fast 7 at the time, Paul's brothers Caleb and Cody were hired to stand in for him for the remainder of production, before his face was digitally superimposed onto their bodies.
"I think Vin and the whole family have done a good job tastefully letting the character ride off into the sunset. I think Paul would get a real kick out of where it's gone. It's gotten so crazy. It's a wild, wild ride at this point," said Cody, who briefly appeared in Furious 7 while helping the franchise write off Walker's character.
"I can't speculate what he would think, I just know that Vin always takes a very serious approach to keeping Paul's legacy in mind and has always done a really nice job paying tribute to his character," Cody added. "They worked together and were brothers for years. They were all so young when this thing first started."
Carlos Alvarez/Getty Paul Walker and Jordana Brewster
The Fast and Furious star, 42, opened up to PEOPLE about how she grieves for her late costar in an interview last year.
"I think when someone passes away that has a huge impact on your life and has had a huge impact, frankly, on so many people's lives," Brewster told PEOPLE of Walker, who played her onscreen husband in the action movie franchise.
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Her grief "goes in waves where it's super visceral at times, and it's like it's unimaginable that that person's not with us anymore," she shared.
"It just gets very intense and then sometimes it's less intense," Brewster continued. "But it just comes in waves, regardless of whether it's that person's birthday or not."