In his 91-page document overturning Brendan Dassey's 2007 conviction for assisting in the murder of Theresa Halbach, Judge William Duffin wrote that Len Kachinsky, public defender representing the then-16-year-old, had acted inexcusably in helping the prosecution.

During the case, which was documented in the popular Netflix series Making a Murderer, Kachinsky arranged for Dassey to undergo a second unsupervised police interrogation after the teenager had already given a written confession. Throughout the case, Kachinsky repeatedly gave inept legal council, failing to visit with Dassey and working with the prosecution. As a result, Kachinsky was removed from the case before it went to trial.

But the damage had already been done. This confession, arranged by Kachinsky, helped put Dassey behind bars for nearly 10 years.

On Friday, Duffin overturned this conviction, arguing that these confessions had been coerced by police. "These repeated false promises, when considered in conjunction with all relevant factors, most especially Dassey's age, intellectual deficits, and the absence of a supportive adult, rendered Dassey's confession involuntary under the Fifth and Fourteenth Amendments," Duffin wrote.

Even though it did not warrant overturning the conviction, Duffin also touched on Kachinsky's behavior pre-trial.

"Kachinsky's conduct was inexcusable both tactically and ethically," Duffin wrote. "It is one thing for an attorney to point out to a client how deep of a hole the client is in. But to assist the prosecution in digging that hole deeper is an affront to the principles of justice that underlie a defense attorney's vital role in the adversarial system."

Now, Kachinsky tells the local ABC News affiliate that he's pleased and surprised that Dassey's conviction has been overturned. And he's also taking credit for it.

"In the sense that [the confession] was an instance that I preserved for appeal, before I was off the case, I was in sense gratified because the fact that that was the basis for magistrate judge Duffin's decision, it shows that I did my job," Kachinsky said. "Without a confession, the state didn't really have anything of a case. It was an issue that was clearly available to appeal."

Okay, guy.

Matt Miller Culture Editor Matt is the Culture Editor at Esquire where he covers music, movies, books, and TV—with an emphasis on all things Star Wars, Marvel, and Game of Thrones.

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