Gibson, 65, who made four “Lethal Weapon” films, called Donner his “friend and mentor.” In a statement to Deadline released Monday, the actor said, “Oh, the things I learned from him! He undercut his own talent and greatness with a huge chunk of humility referring to himself as ‘merely a traffic cop.’ He left his ego at the door and required that of others. He was magnanimous of heart and soul, which he liberally gave to all who knew him. If we piled up all the good deeds he did, it would stretch to some uncharted place in the firmament. I will sorely miss him, with all his mischievous wit and wisdom.”