Authorities would not say who testified Friday, citing the secrecy of the grand jury proceeding. But a source close to the investigation said two acquaintances of Skakel appeared as witnesses.
Martha Moxley, 15, was beaten to death with a golf club on Oct. 30, 1975. The 6-iron used to kill her was matched to a set owned by the Skakels, who lived near the Moxleys in the exclusive Belle Haven community in Greenwich.
Michael Skakel, who was 15 at the time of Moxley's death, and his brother, Thomas, then 17, have been identified by authorities as the only two remaining suspects in the case.
Michael and Thomas are sons of Rushton Skakel, the brother of Ethel Kennedy, U.S. Sen. Robert F. Kennedy's widow.
Both Michael and Thomas were among a group of friends with Martha the night she was killed.
The grand jury, which consists only of Superior Court Judge George Thim, has been hearing testimony since July, including testimony from friends who were there that night.
Thim was appointed as the one-man grand jury in June. Prosecutors had hoped to finish the investigation by the time Thim's six-month appointment ends in December, but recently applied for a six-month extension.
The investigation has been delayed by efforts by various witnesses to fight subpoenas and by an attempt by Michael Skakel's lawyers to bar testimony about statements he may have made about Moxley's killing while he was a student at a school for troubled teens.
Judge Edward Stodolink is expected to hear more testimony on that issue on Dec 1.
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