>> reporter: brandon dacey, steven avery's 16-year-old nephew then, admitting he helped his uncle kill teresa halbach. >> tell me where he shot her. >> like in the head and in the belly and stomach. >> reporter: critics say this video shows dacey, who has a low iq, being manipulated into giving a false confession. >> looking at the interrogation tape of brendan dacey, what leaps out to you? >> cognitively impaired, naive young man, led by intelligent, well-trained adults, using a manipulative set of techniques to try to get him to reveal details or adopt a storyline. suggested to him. >> am i going to be at school before school ends? >> probably not. >> reporter: but the judge ruled that the confession was given freely and willingly so it was allowed into evidence during >> you feel confident what we're seeing is a legitimate confession? >> yes, i would invite any of your viewers to read the entire transcript. and before again buying what is spoonfed them. >> reporter: even though furg during his trial brandon said he made it all up, he was sentenced to life in prison. >> we the jury f

>> reporter: brandon dacey, steven avery's 16-year-old nephew then, admitting he helped