Fast & Furious X2 will have character Brian O’Conner back in the show. But...... the actor for Brian is none other than Paul Walker, who passed away in 2013. In the last movie that Paul acted, which is Fast 7, certain scenes were being acted by Paul's brothers and body double, with Paul's head being CGI onto the actor's body. It is over 10 years now, doing CGI for a actor that passed should have improved now so it shouldn't be any issue. At least Vin Diesel think so. Vin Diesel announced the news that Paul's character Brian O’Conner will make an appearance, either as a main character or cameo in the latest Fast movie.
https://malaysia.news.yahoo.com/vin-diesel-reveals-fast-furious-165507484.html