For those of you who haven't read about the real case that the movie is based on, the Los Angeles Times has a backgrounder here. It has also been posting some of its original stories online; you can even see how the stories were played on the page. One section is here. You probably should see the movie before reading the stories. Some of the material could be considered spoilers. And some of it differs from the way the movie tells the story, so it might be more interesting to you have you have seen what the movie did.