Updated

The FBI says a black civil rights activist was killed during the 1973 occupation of Wounded Knee, and it suspects militant members of the American Indian Movement are responsible.

Documents recently released by the FBI to a Buffalo, N.Y., lawyer shed new light on the 40-year-old case of Ray Robinson, an activist and follower of Martin Luther King Jr.

The father of three from Bogue Chitto, Ala., traveled to South Dakota in April 1973 to stand alongside Native Americans in their fight against social injustice. He never returned and his body was never found.

His widow, Cheryl Buswell-Robinson, of Detroit, has said the family wants to bring his remains home for a proper burial.

AIM was founded in the late 1960s to protest the government's treatment of Indians.