RAPID CITY, S.D. (AP) – A federal judge has postponed the trial of a man charged in the 1975 killing of a fellow American Indian Movement activist on the Pine Ridge Indian Reservation in South Dakota.

Richard Marshall is charged with murder and aiding and abetting in the death of Annie Mae Aquash (AH’-kwash). Marshall’s trial was scheduled to begin Tuesday in Rapid City.

But defense attorney Dana Hanna filed a motion to delay the proceedings and U.S. District Judge Lawrence Piersol agreed Thursday night to move the trial to April 13.

Hanna says he needs more time to review last-minute information from the Denver Police Department, which investigated the killing and later destroyed some of the evidence.