The protagonist of "Making A Murderer" is speaking out.

Steven Avery, who is from Wisconsin, spent 18 years in prison for a sexual assault crime that he didn't commit before being released and was then sent back to prison for life without parole after being accused of a murder. His story is detailed in the widely popular Netflix series "Making a Murderer."

A Milwaukee reporter sent Avery an inquiry asking for comment about the eight-part series.

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He responded with a three-page letter.

In it, he continued to maintain his innocence.

He wants to give a formal interview, but the Department of Corrections will not allow it, WISN reports.

Meanwhile, Avery's ex-girlfriend Jodi Stachowski, who maintained his innocence originally, changed her stance when she spoke to Nancy Grace about him on air.

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Avery devoted a portion of his letter addressing her comments.