>> during the time rhonda was pushing for death for her son's killers, nathan dunlap continued to work on his appeals. >> this was not a chance to proof that he was innocent, to set dunlap free. the focus was on his mental health and any other mitigating factors that could have gone into a jury's decision about whether he should be put to death. >> nathan dunlap's attorneys make a pretty powerful case about bipolarity saying this was not properly explored. in the original case. >> by 2006, prison doctors had finally diagnosed nathan as bipolar and put him on the powerful drug, lithium. once medicated, nathan's behavior on death row changed radically, and he became a model prisoner. >> he was an entirely different person from the young man even that i knew.