BOSTON, Oct. 29 (UPI) Kennedy clan cousin Michael Skakel reveals for the first time in a book proposal that he tried to kiss a 15-year- old neighbor just hours before her bludgeoned body was discovered in Greenwich, Conn., 24 years ago Halloween Eve.

Michael and his brother Thomas, nephews of Ethel Kennedy, widow of Sen. Robert F. Kennedy, have been described by authorities as prime suspects in the 1975 unsolved slaying of Martha Moxley.

The Boston Herald Friday reported it has obtained a copy of Michael Skakel's 38-page book proposal, which has since been quashed by his attorney, Michael Sherman.

The Herald said a one-judge grand jury in Connecticut has been gathering evidence in the case and has just two months before either issuing indictments or closing the case.

Moxley's body was found under a pine tree in posh Greenwich, Conn., on Halloween Eve 1975. She had been beaten to death with a golf club belonging to the Skakel family.

Michael Skakel was 15 at the time, while brother Thomas was 17. The brothers have insisted they had nothing to do with the slaying.

Michael Skakel collaborated on the book proposal with author Richard Hoffman. Some nine hours of tape recorded conversations between the two have been reviewed by investigators.

In the book proposal, Michael Skakel allegedly admitted having been drinking the night of the slaying with his siblings and Kenneth Littleton, a live-in tutor.

He said Moxley and some other neighborhood kids were in his family's kitchen, and he remarked to Littleton that "I thought Martha was really pretty."

He then allegedly asked her to join him for a cigarette outside in his father's Lincoln, which, according to the proposal, was referred to by his siblings as the "lustmobile."

He is quoted as saying that he "really liked her" and "wanted to kiss her," but she declined because she had to go home because her mother had given her a 9 p.m. deadline.

Michael Skakel reportedly gave investigators conflicting alibis in the years following the slaying, including admitting that later, when he couldn't sleep, he climbed a tree outside the Moxley home and threw pebbles at her bedroom window.

Sherman dismissed the quotes in the book proposal, saying they "are the spin and the story created by an author whose primary interest is writing a book, selling it and marketing."

Hoffman, who has testified before the grand jury, said he is convinced Michael Skakel is innocent. He said if he thought Michael was a murderer, "I wouldn't do a book with him."