In 1975, 15-year-old Martha Moxley was killed in Greenwich, CT. More than two decades later, Michael Skakel, a cousin of the Kennedys, was convicted for her murder. That conviction was later overturned. Now, Skakel is speaking publicly about the case for the first time as part of a new podcast from NBC News Studios, ‘Dead Certain: The Martha Moxley Murder.’ NBC News’ Emilie Ikeda reports. | NBC Nightly News with Tom Llamas