McCallany: Who knows? [The BTK Killer] wasn't caught until 2005. He was literally at large for 30 years! We try to remain true to the details of the crimes... Let's hope to God that we get to do this for five seasons. [But] we may never catch the guy. Our journey begins in 1978, are we really going to go up to 2005? I don't think so. We'll span a number of years, but not all of those years. These guys don't solve all of their cases. You don't get to solve them all in real life, and you don't get to solve them all in Mindhunter. You would never see that on a network show.