Attorneys for Kennedy cousin Michael Skakel argued in the state Supreme Court Thursday for a new trial.

Skakel was convicted in 2002 of the 1975 murder of Martha Moxley in Greenwich. He had been accused of beating her to death with a golf club when they were both 15 years old. In 2007, he was denied a new trial by the Stamford Superior Court.

Skakel's lawyers say their appeal is built on a claim implicating two others in Moxley's death.

"Let the jury have the whole shebang, because we all know third party culpability evidence makes a difference," says lawyer Hubert Santos.

Moxley's mother is disgusted at the thought of a new trial.

"I am so convinced he is the guilty person that I just can't even think he'll get a new trial," says Dorothy Moxley.