Diane Robinson, the former wife of slain Alexandria physician Robert S. Rixse, has denied any involvement in her ex-husband's 1984 slaying, her attorney said yesterday.

"She claims to have no knowledge or complicity in the murder," said Plato Cacheris, who said he was recently retained by Robinson.

Cacheris said Robinson, 37, of Marietta, Ga., has been interviewed by Alexandria police investigating the slaying, once shortly after the death and again in August. He said she was willing to speak with them again.

Robinson's second husband, John Kennedy Robinson, has been charged by police with conspiracy to commit murder in Rixse's slaying. He has denied the charges.

Police have obtained a copy of a purported account, allegedly written by John Robinson, of how the Rixse slaying was planned and executed, according to sources. The account suggests several persons were involved, sources said.

"This purported account found by the police is not in accordance with the facts as Mrs. Robinson knows them," said Cacheris.

John Robinson's attorney, Garland T. Byrd, has said the account was written at a time Robinson was "under pressure" from his failing marriage to Diane Robinson.

The Robinsons, who were married in 1982, moved to Marietta shortly after Rixse's slaying. They were divorced in May.

John Robinson is being held in Pensacola, Fla., pending a trial there next month on apparently unrelated federal drug charges. He has denied the charges.

Rixse, 37, was shot at close range in July 1984 when he opened the door of his Alexandria home after persistent knocking. His three daughters were asleep upstairs at the time.