The widow of Martin Luther King Jr. wants an investigation into possible new evidence that her husband's assassination was part of a conspiracy.

A former FBI agent came forward Tuesday to say he has papers that could help verify claims by James Earl Ray that a shadowy gunman named Raoul set him up to take the blame for killing King in 1968."This is compelling evidence that further strengthens Mr. Ray's appeal for the trial he never had," Coretta Scott King said in a statement.

"I call for a thorough investigation to help bring about at least some sense of closure to the pain my family and the American people have endured over unanswered questions surrounding this tragedy."