Constitutional Due process only comes into play if a government agency is involved in the dismissal. So that should not be the case here. O'Reilly did get something many do not get (besides the huge severance)-- he got an independent internal investigation by an outside law firm (for which there are rules to insure independence) into the complaints against him and was only dismissed after evidence was uncovered adn reviewed by the investigation. This was at least-- ifnot more--fair for him than a governmental investigation would have been.