The True Story of Mindhunter's BTK Killer Is the Most Messed-Up Thing

Never sleeping again, it's fine. At this point, you might know him best as the "ADT Serviceman," but trust: that creepy guy in all those Mindhunter vignettes is 100% based on a real person. Meet the BTK Killer (aka Dennis Rader), one of the most notorious serial murderers of our time. And when I say …