Serial killer FAMILY hides bodies in SECRET ROOM using SECRET TRAP DOOR... In this true crime documentary, we're covering one of the most bizarre cases we've EVER covered: the story of not one serial killer, but an entire FAMILY of serial killers. Believe it or not, back in the 1800s, two serial killer families would come to surface. The Kelly Family and the Bloody Benders were both families who worked together to commit heinous crimes, and the true story behind these murders is simply unbelieva