In March of 2010, 34-year-old Jamie Laiaddee goes missing from a Phoenix, Arizona suburb. Ten weeks pass before anyone begins to worry. Investigators zero in on her boyfriend, Bryan Stewart, who actually doesn’t exist. Who is Bryan Stewart? And can the police believe that he helped Jamie disappear? Bryan claims that Jamie is alive and doesn’t want to be found, but detectives have their own theories. 48 Hours correspondent Erin Moriarty takes you inside the investigation into the death of Kari Baker on her podcast, My Life of Crime. Based on the 48 Hours episode, "The Stranger Beside Me”.