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Dassey. >> even they know that that is bad police practice. >> reporter: then they discovered something at the end of that interview which was a revelation to them. something jurors in his trial never heard. dassey speaking to his mother. at the first moment that brendan gets outside the influence of those interrogators, he says, no, this is not true. they got to my head. >> reporter: but tom fassbender, the interrogator himself seize it all very differently. >> coming up. >> reporter: this was scene by many as a false confession. >> i feel a real confession. he knew right from wrong. brendan ...

>> that was clearly a mistake. >> reporter: this is huge, though. >> i agree. >> you got a 16-year-old kid with a low i.q. with no attorney present, no parent. it's kind of like feeding someone to the wolves in a way. would you apologize to brendan dassey? >> well, i'd apologize him for not being at that interview. >> reporter: there were mistakes made? >> oh, sure but -- >> there are people who disagree with that. >> oh, sure. >> reporter: but as dassey's attorneys delved further into the stunning statements the teen made, they came to believe something more disturbing. that investigators tom...

That i -- you know, that is partly why i'm here is to explain there was nothing nefarious done. >> reporter: even fassbender wonders if everything dassey said in the confession was true. >> we didn't try to manipulate brendan. we tried to get at the truth and i don't believe that it was a false confession. are there parts of it that he may have not done? i don't know. you know? i just don't know. >> reporter: in august of 2016, a federal judge weighed in with a bombshell in response to a brief filed by dassey's attorneys, judge william dunen ruled that dassey's confession was involuntary. with...

Killing of a young photographer. but were they really innocent? >> i didn't do it. somebody's doing a good job against me. >> did you have a vendetta against steven avery? >> absolutely not. >> for the first time on television a lead investigator defends his interrogation which led to the conviction overturned. >> this was seen by many as a false confession. al. >> i feel it was a real confession. >> we need you to be honest with us. >> right from wrong. >> those officers wanted that information in the worst way. and they got it in the worst way. >> the prosecutor fights back with an explosi...