A Pennsylvania father is seeking answers after his teen son died on Friday night after allegedly being chased by other teens who had come to his home and asked him to play a game of tag, the father told ABC News. Orville Johnson told ABC News that his son, Justin Johnson, had sickle cell disease and he understood that because of his condition, the teen could not run or exert too much energy because it could "cost him his life if he has to do anything like that." "He was so special," Johnson said