The tragic news of Paul Walker's untimely death at 40 in a fiery, two-person, single-car crash in Los Angeles yesterday (Nov. 30) is marinating among Hollywood, the media and his fans. The actor's co-stars and colleagues also reacted and shared their grief on Twitter.

Many seemed in a state of shock over his passing, namely Vin Diesel. Without their chemistry, the 'Fast and Furious' franchise would not be the record book success that it is.

Below are the collected tweets of actors and celebs who had the pleasure of working with Walker over the years.