Law & Order S15E23 - In God We Trust

Detectives Fontana and Falco arrest an arsonist after a blaze killed a fireman, and discover a charred pistol that leads them to re-open a cold case murder of an African-American. Their remorseful prime suspect (Jim True-Frost) not only confesses but pleads not guilty due to his newfound faith and changed life. Even the skeptical EADA McCoy cannot ignore the "Clayton motion" filed by the defense attorney that asks for the case to be dismissed while church and public support build for the former racist who has worked hard for children's charities in the years since.