STAMFORD, Conn. (AP) _ A man who implicated two friends in the 1975 murder that sent Kennedy cousin Michael Skakel to prison has invoked his Fifth Amendment right against self-incrimination, his attorney and a prosecutor told The Associated Press Thursday.

Gitano ``Tony'' Bryant took the Fifth at his deposition last week in Miami and does not plan to testify at upcoming hearings on whether Skakel deserves a new trial, said Joel Denaro, his attorney.

``After advice of counsel, Mr. Bryant has exercised his Fifth Amendment right to remain silent,'' Denaro said. ``We'll be taking the Fifth Amendment in any and all proceedings.''

Bryant's move could complicate Skakel's efforts to win a new trial. Skakel is serving 20 years to life in prison after he was convicted in 2002 of bludgeoning neighbor Martha Moxley to death with a golf club when they were teenagers in wealthy Greenwich.