It's based on a true story....
...that occured almost 20 years before the film was released in Alburn, California. I read this in a comment made by a user, does anyone have any info on the case???
R.I.P. River Phoenix
Maybe a little bit late but their names were Cindy Collier and Shirley Wolf.
From crimelibrary.com:
"Cindy Collier was 15 and Shirley Wolf 14 when they started prowling condominiums in California in 1983. They knocked on doors at random to gain admittance. An elderly woman let them in and sat chatting with them as they thought up a plan to steal her car. Shirley grabbed her by the neck while Cindy found a butcher knife and tossed it to her. Shirley stabbed her victim 28 times, even as the old woman begged for her life. They fled the scene, but were soon arrested. Both confessed that the murder was "a Kick" and that they wanted to do another one. They thought it was fun."