>> who killed martha moxley. >> we know who killed martha. we have proved it. >> it was a very intense case. >> it's a throw down now. >> i'm lester holt and this is "dateline". >> is it hard for you to fathom that 40 years after the murder of your sister, there's still legal issues surrounding this case. >> 41 years is a long time and i can't tell you how many times we have been in the courtroom and it's mind boggling in a lot of ways. >> every time there's a legal twist or turn, what does it do to your peace of mind? >> i don't know that there are legal uncertainties, we have proved it and he was convicted and he was sent the jail. >> but the case has been turned upside down. the man convicted of killing 15-year-old martha is out of prison. michael skakel's conviction has been set aside and judges are got to decide whether he gets to stay free. his famous cousin, robert f. kennedy jr. has listening defended him. >> there's no way that michael skakel could have committed this murder and there's no way me did. >> now he's naming the people th

. >> rose: what happened to martha moxley and what did you know about it at the time?>> i didn't know anything about it until eight year later. >> rose: never heard about the murder or trial? >> the first time i heard about it was when tommy skakel his eldest brother came to our house in 1983 and somebody said he was a suspect in the murder case and that's the first i'd ever heard of it and what i do in the book is michael himself was never a suspect uetil mark furman made him a suspect after the crime. >> rose: what happened to martha moxley. >> she was killed by two men in new york city who were brought to greenwich by a boy name toby bryant. a cousin bof the basketball sta kobe bryant and his elder brother played for the mavericks and was a classmate of michael skakel and in 1975 he moved back to he city and his mother was an oscar-winning producer. the first african-american woman to win oscar for a production and first african-american. she and -- when he went back to new york city and moved to a public high school in new york and made friends with these two young

fellow teacher jesika moxley was in awe of the amount of energy miss jones poured into her classroom. >> heather loved being a kindergarten teacher. from the moment that they stepped foot into the door, to the moment that they left, they were dancing, they were singing, they were playing. >> reporter: by april 2013, it was all coming together for heather jones. on a saturday night, she hit that rumba room dance floor to try out some moves she'd picked up at the gym and to show the world what she'd become. >> it was just so much fun. we were probably there for about three hours just dancing. >> reporter: three days later on tuesday morning, teacher jesika moxley headed to school, expecting to see her energetic co-worker heather already there. >> our school day didn't start until 8:00 or 8:30 that year, and she was here every morning by 6:30, 6:45. >> reporter: heather usually couldn't wait for the school day to begin. so jesika was surprised by what she didn't see that morning. >> i pulled into the parking lot, and i didn't see her car. i'm, like, "oh, what is going on?" >> reporter: t

. >>> and was michael skalel framed for the murder of martha moxley? explosive claims in the 41-year-old case from robert kennedy jr. we'll talk to him. >>> but first on a tuesday morning, this is "today" on nbc. >>> coming up, how to share your netflix password could land you in serious trouble with the law. >>> plus, the magnificent seven. we will re-unite the women's gymnastics team 20 years after they won gold and captured the they won gold and captured the world's hearts in atlanta. they won gold and captured the world's hearts in atlanta. i had a wonderful time tonight. me too! call me tomorrow? i'm gonna send a vague text in a couple of days, that leaves you confused about my level of interest. i'll wait a full two days before responding. perfect! we're never gonna see each other again, will we? no-no. wouldn't it be great if everyone said what they meant? the citi double cash card does. it lets you earn double cash back. 1% when you buy and 1% as you pay. the citi double cash card. double means double. ii can't believe it's made with real, simp

on eve of halloween, 1975, martha moxley did not come home after a night of miss chief in connecticutonviction of a neighbor, michael skakel, 15 at the time of the murder, convicted at the age of 41. the case brings the inner section of wealth, privilege and one of america's most famous families. michael skakel is a kennedy cousin. his conviction has now been set aside because a judge ruled he didn't get an adequate defense. now prosecutors trying to have that conviction reinstated. but his cousin, robert kennedy jr., is out with an explosive new book today called "framed," why michael skakel spent over a decade in prison for a murder he didn't commit. in the book, kennedy, a former prosecutor, lays out the case why his cousin couldn't have killed martha moxley that night. kennedy says i shouldn't take his word for it, i should look at the facts. >> what i believe is completely irrelevant. you know, people should not trust what i believe. i have a relationship with michael. i strongly believe that he's innocent. that belief should not persuade anybody that he is innocent. what people

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