MSNBC Chief Legal Correspondent Ari Melber's exhaustive investigation into the death of a Virginia man in police custody. Linwood "Ray" Lambert died three years ago, after police took him to a local hospital for medical care. But police never brought Lambert inside, instead tasing him repeatedly at the doorway to the hospital, and later inside a squad car. In September, Melber obtained 80 minutes of security camera footage. Melber led a months-long investigation, combing through the video to reconstruct the incident, obtaining previously unreleased police, medical and investigative files, and interviewing dozens of sources. The material gave MSNBC an opportunity to tell the story of that deadly night for the first time. State investigators and local prosecutors provided Melber some of their first public comments on the incident. Melber's work also spurred outcry from officials and civil rights leaders, including calls for a resolution to the case by Virginia's governor, and both U.S. Senators from Virginia.