Steven Avery has finally spoken out in the midst of Making a Murderer mania.

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Avery, whose multiple convictions are chronicled in the Netflix docuseries, sent a handwritten letter to local Wisconsin news station WISN last week. Currently in prison, the Wisconsin native urged, "Do an investigation of the sheriff of Manitowoc County."

Continuing to plead innocence, Avery said that the person who really killed photographer Teresa Halbach in 2005 is still out in the world.

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"The real killer is still out there. Who is he stalking now?" he wrote. "I am really innocent of this case and that is the truth!!! The truth will set me free!!!!!!!"

Avery also wrote about his ex-fiancée, Jodi Stachowski, calling him a "monster" in a new interview with Nancy Grace.

"How much money Jodi get to talk bad!" he wrote, clearly implying that she has been coerced into changing her story.

Meanwhile, Calumet County prosecutor Ken Kratz, who is featured throughout Making a Murderer, reportedly wanted to write a book about Avery's trial as long as he confessed to Kratz.

Kathleen Zellner, Avery's latest attorney, released a full letter on Sunday that was sent from Kratz's office to Avery back in September.

"I apologize for misunderstanding your letters from a couple years ago, as I thought you were interested in being honest about what happened and finally telling the whole story to someone. Since I'm the person who probably knows more about your case than anyone else, I hoped that you would choose me to tell your story to," the letter reads.

"Unfortunately, you only want to continue your nonsense about being set up. That's too bad, because you had ONE opportunity to finally tell all the details, but now that will never happen.

"By the way, the difference between you and famous convicted murderers from the past is they told their whole truthful story to someone, who then wrote a book about what actually happened and people got the understand both sides. I was willing to do that for you..."

All 10 episodes of Making a Murderer are currently available to stream on Netflix.

Tags: Making a Murderer television netflix