sentences krone to life in prison. but in light of the dna evidence presented in court, admits to having doubts about the verdict. >> he said it was the most troubling case of his career and so forth. so even the judge recognized there may be problems. >> plourd vows to continue to fight for krone's exoneration. ray krone returns to prison and begins serving his life term. coming up, a newly formed dna database may reveal key missing information. >> everything just stopped running. my heart, my breathing. what did you say? cuban