http://img7.onemanga.com/mangas/00000026/00000110/15.jpg
[spoiler]Okay, it was never stated that Misa committed suicide, but she did die a year after Light's death and most people think that she committed suicide due to her greif over Light's death.
Although now that I think about it, it's definitely possible she died due to the fact that she made the eye deal twice, effectively crippling her life span. But then again, that seems to be a really short timespan.[/spoiler]
Even if my first point isn't valid, you still can't deny how insanely addicted to Light she is.
