May His Memory Be Eternal
May God grant him eternal life,rest and peace, and also be with you and your family. Find comfort in the fact that he went peacefully in his sleep, despite the fact that he was young. I know it sounds easy to say, but my father is suffering from Parkensons. He can't even talk anymore. It's painful to watch. He's 81, but sometimes I pray the angels will come for him because he's too good a man to be suffering like this.
May your father's memory be eternal.