as for ken kratz, the former prosecutor, and his new book, zellner dismisses the climbs of interactions no proof that avery was becoming obsessed with ms. halbach. zellner also notes, mr. kratz has no qualifiatiications that would allow him to diagnose mr. avery as a psychopath. kratz says he's undaunted. are you afraid of kathleen zellner? >> no. i'm not involved in the case anymore. >> she could unravel your work, if what she's saying has some weight to it. you don't think she has a chance. >> i don't. >> she's so confident. why are you so confident? >> we put 18 months putting this case together. it wasn't just thrown together. it wasn't a bunch of keystone kops. it was done very well. >> kratz says he admits to drug abuse, a scandal that led to his resignation. he takes issue with "making a murderer," but is moving on with his life. >> i'm hoping this book will change the narrative. >> with all of the looks at guilt or innocence, with all of the trials and retrials, kim says what is forgotten is her friend, teresa. >> i love hugs. >> for her memories, she says she goes back to this