Jodi Stachowski, the former fiancée of Making a Murderer subject Steven Avery, is not mincing words.

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Stachowski, who is featured throughout Making a Murderer as well, spoke with HLN's Nancy Grace this week and revealed just how she feels about Avery.

"Steven's the one person I don't trust," she said. "He's like Dr. Jekyll and Mr. Hyde...behind closed doors, he's a monster."

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Despite Making a Murderer attempting to prove Avery's innocence (or at least, corruption in the justice system involved in his criminal charges), Stachowski is convinced that he is guilty of the murder of Teresa Halbach.

"Yes I do," she said, when asked if she believes Avery murdered Halbach, "because he threatened to kill me and my family and a friend of mine."

Stachowski said she believed he was capable of murder.

"Yeah," she said, "Hurting people. He told me once, excuse my language, 'All bitches owe him' because of the one that sent him to prison the first time. We all owed him."

She also recalled her violent past experience with Avery:

"He'd beat me all the time, punch me, throw me against the wall. I tried to leave and he smashed the windshield out of my car so I couldn't leave him."

Stachowski also believes that Avery's nephew, Brendan Dassey, is innocent.

"I believe Steven threatened Brendan...if Brendan didn't do what Steven said, he'd hurt him."

You can watch all 10 episodes of Making a Murderer on Netflix now.

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