I haven't watched the anime in years but if I remember right after he died ryuke took back the death note. I don't remember what happened to her and her death note but even if she lived she couldn't pull it off like light could have. I need to re watch that anime it was my favorite for a really long time and if I made a list it would probably still be top 5 and definitely top 10. Two of the movies are like the anime with light and l but different stuff happens with a different ending. The third is about L before Kira showed up. There is also two animated movies but there just the anime shortened into three hours.