Author R.A. Montgomery -- founder of the "Choose Your Own Adventure" book series -- has died. If you'd like to know more about his death ... go to paragraph 2. If you'd like to learn the author's history ... go to paragraph 3. Montgomery passed away at his home in Vermont last Sunday. His family hasn't released the cause of death. The author created the series in the '70s and more than 200 "CYOA" titles were eventually published. It's one of the best selling children's book series of all time.