Jodi Stachowski, the ex-fiancee of “Making a Murderer” subject Steven Avery, is speaking out, appearing on “Nancy Grace” Wednesday night to call Avery guilty of killing photographer Teresa Halbach.

Stachowski, who appeared in the Netflix documentary, also calls Avery a “monster,” and says he “beat her all the time.”

“He told me once, all bitches owe him, because the one that sent him to prison the first time,” she says, referring to Avery’s wrongful conviction for sexual assault in 1985, for which he was in prison for 18 years. “We all owed him. And he could do whatever he wanted”

“Steven’s the one person I can’t trust,” she went on. “He’s a monster.”

Stachowski also said she originally didn’t want to be on “Making a Murderer,” apparently telling director and writers Laura Ricciardi and Moira Demos that she wanted no part in it. “Steven called me and told me that if I didn’t say anything good and nice about him, I’d pay,” she says. “He’d beat me.”

Asked if she believes that Avery is guilty of the murder of Halbach, Stachowski says, “Yes, I do. Because he threatened to kill me and my family and a friend of mine.”

She also describes incidences in which Avery allegedly threatened to throw a blow dryer in the bathtub while she was taking a bath, along with other stories of abuse.

The “Nancy Grace” interview marks a change of tone for Stachowski, who appeared as a supportive fiancee at the time. But she says “it was all an act.”

“He told me how to act,” she says. “Smile, be happy. I didn’t know what to do. I didn’t want to get hurt.”

Stachowski goes on to say that she intentionally poisoned herself to get away from Avery: “I ate two boxes of rat poison just so I could go to the hospital and get away from him, and ask them to get the police to help me,” she says.

Stachowski and Avery were engaged when Avery was arrested on suspicion of killing Halbach in 2005. They broke up before his 2007 conviction.

Grace has been open about her skepticism of Avery, previously debating New Kids on the Block member Donnie Wahlberg about it. Stachowski’s interview comes one day after Avery filed an appeal.