The ruling yesterday marked a dramatic reversal after years of unsuccessful appeals by Skakel, the 52-year-old nephew of Robert F Kennedy's widow, Ethel Kennedy. Skakel is serving 20 years to life.
Bridgeport State's Attorney John Smriga told The Associated Press that prosecutors will appeal the decision.
Skakel's current attorney, Hubert Santos, said he expects to file a motion for bail today. If a judge approves it, Skakel could then post bond and be released from prison.
Prosecutors contended Sherman's efforts far exceeded standards and that the verdict was based on compelling evidence against Skakel.
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Prosecutor Susann Gill said the state's case included three confessions and nearly a dozen incriminating statements by Skakel over the years. She also said there was strong evidence of motive.
"His drug-addled mental state, coupled with the infuriating knowledge that his hated brother Tommy had a sexual liaison with Martha, and the fact that Martha spurned his advances, triggered the rage which led him to beat her to death with a golf club," Gill wrote.
Santos contends Sherman was "too enamored with the media attention to focus on the defense." Sherman told criminal defense attorneys at a seminar in Las Vegas six months before the trial that one of his goals in representing Skakel was to have a "good time," Santos said.
"Defending a murder charge ... Is not about getting invited to A-list parties in New York City, or launch parties for the trendy new television show, or going to the Academy Awards and all the 'cool parties' afterwards," Santos wrote in court papers.
Skakel, who maintains his innocence, was denied parole last year and was told he would not be eligible again to be considered for release for five years.