( CNN ) -- A day after he won a new trial in the murder of a 15-year-old girl , Michael Skakel , the nephew of Robert and Ethel Kennedy , filed a bond motion Thursday asking he be released from prison pending a second trial 's outcome . The motion asks the court to set a bond in an amount `` no greater than $ 500,000 cash or surety . '' Skakel , 53 , who has spent more than a decade behind bars , is accused of killing Martha Moxley with a golf club in 1975 . Twenty-seven years after her death , he was convicted and sentenced to 20 years to life in prison . For years , Skakel fought unsuccessfully for his conviction to be overturned . On Wednesday , a Connecticut judge ordered Skakel 's conviction to be set aside , ruling that the defense in the 2002 trial had been inadequate . Timeline : Michael Skakel . State 's Attorney John Smriga said prosecutors planned to appeal the ruling . Skakel poses no flight risk and has maintained strong ties to the community throughout his imprisonment , his motion argued . Skakel has a 14-year-old son `` with whom he maintains close contact and has remained actively involved in his rearing , to the extent possible from prison , '' the motion said . His continued incarceration is n't `` necessary to protect '' the public or the Moxley family , which now resides outside of Connecticut , court papers said . Skakel would agree to electronic monitoring upon release from prison , the motion said . Prior to his trial , Skakel voluntarily surrendered to authorities in January 2000 , and when he was released on bond after that arrest , `` he never failed to attend court , '' the motion said . John Moxley , Martha Moxley 's brother , told CNN Thursday that he still believes that Skakel is guilty and would be opposed to his release from prison . `` My mother and I would n't be in favor of bail , but you know , the reality is , we have no control over it , '' Moxley told CNN 's `` AC360 . '' `` And I ca n't let myself get consumed , and my mother 's not going to get consumed , by stuff that 's out of our control . ... If it comes to a trial , we 'll be there supporting the state of Connecticut . '' Moxley 's body was found in 1975 after a night of partying with Skakel , his older brother Tommy and other teenagers in an affluent gated community in Greenwich , Connecticut . Authorities said she was bludgeoned and stabbed to death ; a broken golf club was found near her body . The case languished for more than two decades . A series of books on the high-profile crime renewed interest , leading to new tips and a new suspect in January 2000 : Skakel , who was 15 at the time of the killing . Skakel has always proclaimed his innocence . But a jury convicted Skakel of murder on June 7 , 2002 . He is behind bars at the MacDougall-Walker Correctional Institution in Suffield , Connecticut . CNN 's Catherine E. Shoichet contributed to this report .
NEW : The victim 's brother says he will oppose Skakel 's release . Skakel seeks a bond less than $ 500 cash or more . John 's motion says he ' n't , and he has close contact with a year - old son . The prosecutor plans to appeal ruling giving Skakel a new trial .