Given that this case is unsolved to this very day, many true crime enthusiasts have come up with theories as to who is responsible for the letters. One popular theory suggests that the broadcast themselves sent the letters for national media attention and insurance money. Despite this theory being popular, Derek and Maria have firmly denied the accusations. Another theory is that one of the neighbors sent the letters. The neighbor's family has inhabited the house since the 1920s. However, nothing could ever be improved