here with more of our story is andrea cannon. all of the renewed attention in the steven avery saga has shed light on the other defendant in the case. brendan dassey. the teenager had been convicted of rape and murder. but to his family, none of it ever made any sense. is brendan capable of rape? no. i don t think he knew what that was at the time. reporter: in 2008, attorneys steven and laura took up dassey s case for his appeal. they saw a mentally challenged teen with a low i.q. how do you spell gra-r-a-g -r -a -g -eg reporter: brendan is a simple soul and struck business hi humanity. this is not somebody i could see commit ago crime like this. that is the psychological power of interrogation. the two attorneys are based at the northwestern university