Fans are confused about the Mindhunter Season 1 ending! Well, it's no surprise that the Netflix original show featured real-life serial killers throughout the series. Edmund Kemper (aka the Co-Ed Killer), Richard Speck, and Jerry Brudos were all real murderers who were fictionalized in the series. But, those weren't the only killers in the show.

In the beginning of most episodes, viewers saw the ADT serviceman, aka Dennis Rader, who would later become widely known as the BTK Killer. At the end of the Season 1 finale, he was burning drawings of bound women which makes sense since the "B" in his name stands for bind. So, will Season 2 focus on him?

There's a Reddit theory that hypothesizes that Holden Ford's ex-girlfriend, Debbie is the daughter of the BTK killer. "In the first episode, Debbie is there to see a band from Detroit. BTK's daughter was living in Detroit when FBI showed up at her house to tell her that her father was BTK and that her medical records and pap smear had been used to find a familial match," Redditor MacrobionicS wrote. "The night before BTK was arrested, he and his daughter spoke on the phone and he reminded her to get the oil changed in her car. Debbie forgets to put oil in her car and her engine seized, which is why Patrick gave her a ride. Holden gives her a hard time about this and she says something like 'my dad used to remind me to change the oil, maybe you can do the same thing.'"

But unfortunately, we might not know the answer to thee questions surrounding the mysterious killer for quite some time. "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," Holt McCallany (who plays Bill Tench) revealed. "[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." Either way, we can't wait to watch next season!