Well, now that is a horrible tragedy. I can't claim to be a big fan of Paul Walker all by himself, but I love the hell out of the Fast and Furious series. I hope they are still able to finish the last one with him in it - I know they'll have to rewrite something - have him stay at home to protect his wife and kid, or hell, have the bad guy kill him offscreen.....but if this is now going to be the last movie, he needs to be in it somehow. The movies work best with all the original cast in them.
So very sad to lose such a good actor (and by all accounts, a kind and generous person) so young and in such a tragic way.