A Montana police detective believes this notorious serial killer set up Steven Avery to take the fall for the murder of Teresa Halbach.

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Many viewers of Netflix's docuseries Making a Murderer have theories on what really went down in the Halbach case, but former police detective John Cameron has a particularly specific one.

Cameron believes that serial killer Edward Wayne Edwards is behind the Halbach murder and set up Avery and Dassey.

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"He set up Steven Avery and Brandon Dassey for the killings of Teresa Halbach in Wisconsin and that's what's kind of exploded the whole investigation," Cameron said in a new interview with KPAX-TV.

Cameron continued, "During the time Teresa Halbach was killed on Halloween, there were several trials going on in the United States for other murders that Edwards had done on Halloween. They were convicting innocent men for these other killings. Edwards was a ritual killer and a revenge killer."

The detective wrote a book two years ago called Its Me: The Serial Killer You Never Heard Of, which tells the story of Edwards, who murdered at least five people and is expected to be responsible for many more murders.

Further explaining the dangers of Edwards, Cameron spoke of just how the infamous serial killer was able to set so many people up.

"They don't even know who Ed Edwards was," he said. "What he would do is groom his way into their lives, unbeknownst to them, set them up, kill their wife, kill their husband, whoever it might be, and then just sit back and watch every day as he could read the paper about his murders and people are going to be executed. Mr. Edwards is dead now, but he's still killing in his afterlife because he set people up, and they're being executed."

Edwards died in 2011 of natural causes at the Corrections Medical Center of Columbus, Ohio.

Making a Murderer is available to stream in full on Netflix.