As Fast fans know, actor Paul Walker died on November 30, 2013 at age 40, but the character of Brian O’Conner is still alive. Walker’s role in Furious 7 was finished with help from his brothers Cody and Caleb as stand-ins. Brian and Mia Toretto have two children together, and since Mia actress Jordana Brewster was confirmed to be returning for F9 — after skipping Fast 8, aka The Fate of the Furious — it led fans to wonder if Brian would return in some fashion as well.
Article source: https://www.cinemablend.com/news/2492602/f9-vin-diesel-new-paul-walker-post-revives-talk-of-brian-oconner-fast-and-furious-return