Tonight two families tied together by tragedy are grappling with the reversal of fortune. Michael skakel, a kennedy family cousin awaiting word that after 12 years in prison he can walk free on bail... See More
Tonight two families tied together by tragedy are grappling with the reversal of fortune. Michael skakel, a kennedy family cousin awaiting word that after 12 years in prison he can walk free on bail until there is a new trial. At the same time the family of martha moxley, the 15-year-old who died, are vowing they will fight. Amy robach has the story. Reporter: Tonight michael skakel is requesting release from prison while he awaits a new trial in the murder of his neighbor and friend martha moxley. She was beaten with a golf club that was traced to a set owned by his mother. A friend testified he is confessed privately to him. Publicly skakel has always maintained his innocence. What I do every day is pray to god and to martha that whoever did this crime is brought to justice. Reporter: Skakel is serving 20 years to life. He is connected to the kennedy dynasty through his aunt, ethel, the widow of robert f. Kennedy. Rfk jr. Is his first cousin. It was an attractive narrative for people that somehow this kid, because of his connections to my family, had gotten away with murder. The fact is that he didn't commit the murder. Reporter: That conviction has now been thrown out by a connecticut judge, ruling that skagle's trial concern did not provide a constitutionally adequate defense. How unusual was this decision? It's almost unheard of to win it in a high profile case with a really well paid lawyer. A very well known media friendly lawyer. I was shocked reading this ruling. Reporter: Next week is the 38th anniversary of martha's murder. Her mother dorothy waited 27 years for the first trial. I'm 81 years old and I still have some spunk left in me and i will be there. At the new trial? Every day I possibly can. Reporter: Martha's mother said this will not change the evidence. She said he's guilty and she still has confidence in our justice system.
This transcript has been automatically generated and may not be 100% accurate.