If you're ever itching to watch a true crime movie, you know that Lifetime has some of the best. They've focused on plenty of big stories, like those of Casey Anthony, Natalee Holloway, and Erik and Lyle Menendez. But they've also made movies based on crimes you may have never even heard of that are just as eerie and awful as the ones that captured headlines for years. What's even creepier than watching a movie about a famous serial killer, like The Capture of the Green River Killer, is discovering the movie you just watched is based on a real-life murder that seems too crazy to be true.

Yep, some of your favorite Lifetime movies are based on real murders and kidnappings that will seriously haunt you. Because the idea that someone like the assailant from The Girl in the Box could really exist is so much more frightening than any scary movie could ever be. Ready to find out more? Check out the terrifying true crime tales behind your favorite movies below.